Answer:The second equation in the system, 4 + 3y = 5, simplifies to 3y = 1, which means y = 1/3.
Substituting this value of y into the first equation gives:
-9x - 2(1/3) = -16
Multiplying through by 3 to eliminate the fraction gives:
-27x - 2 = -48
Adding 2 to both sides gives:
-27x = -46
Dividing both sides by -27 gives:
x = 46/27
Therefore, the solution to the system of equations is x = 46/27 and y = 1/3.
Step-by-step explanation:
Which recursive sequence would produce the sequence 4, -14, 58, ...?
a₁ = 4 and an = -4an-1 +2
a₁ = 4 and an = −3an-1 – 2
a₁ = 4 and an = 2an-1
a₁ = 4 and an = −2an-1-3
Answer:
The first one is the right one
Step-by-step explanation:
The recursive sequence that produces the sequence 4, -14, 58, ... is given by:
a₁ = 4
aₙ = -4aₙ₋₁ - 2, for n ≥ 2
determine the qualities of the given set. (select all that apply.) (x, y)| x ≠ −3 Open,Connected, or simply connected
The given set is {(x, y) | x ≠ −3}, open and connected. Option a and b are correct.
The set is open because for any point (x, y) in the set, we can find a small neighborhood around it (an open ball) that is entirely contained within the set. Specifically, we can choose a radius smaller than the distance from x to -3 to get an open ball around x that does not intersect -3.
The set is connected because any two points in the set can be connected by a continuous path within the set. This follows from the fact that the set is an open interval in the x-axis, which is a connected space.
The set is not simply connected because it has a "hole" at x = -3. Specifically, any closed curve in the set that encircles x = -3 cannot be continuously shrunk to a point within the set. This means that the set fails to satisfy the more stringent condition of simply connectedness, which requires that every closed curve in the set can be continuously shrunk to a point within the set. Option a and b are correct.
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Which of the following ordered pairs is NOT a solution to the system
of equations?
y=2x-1
y = 2(x-1) +1
(0, -1)
(2.3)
(-2,-5)
(-8, 15)
(8.15)
Answer:
[tex](-8, 15)[/tex]
Step-by-step explanation:
First, solve this system. Since [tex]y=y[/tex],
[tex]2x-1 = 2(x-1)+1\\2x-1=2x-2+1\\2x-1=2x-1[/tex]
Thus, they are the same equation.
Now, plug in to find:
[tex]-1 = 2(0)-1 (correct)\\3 = 2(2) -1 (correct)\\-5 = 2(-2) - 1 (correct)\\15 \neq 2(-8) - 1 (incorrect)\\15 = 2(8) - 1 (correct)[/tex]
Thus [tex](-8, 15)[/tex] is the ordered pair that doesn't work.
Gcmf and factor form of 5x²-10x³
5x² is the greatest common monomial factor (GCMF) of 5x²-10x³, and 5x²(1-2x) is the factored form.
We hunt for the greatest monomial that splits both terms evenly to obtain the GCMF of 5x²-10x³. In this situation, both words have an x² factor, hence the GCMF is 5x². Using the distributive property, we can factor this out:
5x² - 10x³ = 5x²(1 - 2x)
This is the factored version of the formula, which demonstrates that 5x2 is a common factor of both components and that (1-2x) is the remaining factor. We can verify this by multiplying 5x² by (1-2x) and getting 5x² - 10x³, which is the original formula.
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Determine whether each relation is an equivalence relation. Justify your answer. If the relation is an equivalence relation, then describe the partition defined by the equivalence classes.
e) The domain is the set of all integers. xOy if x + y is odd. An integer z is odd if z = 2k + 1 for some integer k.
The relation xOy is not reflexive and not transitive, it is not an equivalence relation. There are no equivalence classes to describe.
To determine whether the relation xoy on the set of all integers, where xoy if x+y is odd, is an equivalence relation, we need to check if it satisfies the three properties of reflexivity, symmetry, and transitivity.
1. Reflexivity:
For any integer x, x+x=2x, which is even.
Therefore, x0x is false, and the relation is not reflexive.
2. Symmetry:
If xOy, then x+y is odd. But y+x is also odd since addition is commutative.
Therefore, yOx, and the relation is symmetric.
3. Transitivity:
If xOy and yOz, then x+y is odd and y+z is odd. Adding these equations together,
we get x+y+y+z=x+z+2y, which is even.
Therefore, x+z is even, and xOz is false. Thus, the relation is not transitive.
Since the relation xOy is not reflexive and not transitive, it is not an equivalence relation. There are no equivalence classes to describe.
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The relation xOy is not reflexive and not transitive, it is not an equivalence relation. There are no equivalence classes to describe.
To determine whether the relation xoy on the set of all integers, where xoy if x+y is odd, is an equivalence relation, we need to check if it satisfies the three properties of reflexivity, symmetry, and transitivity.
1. Reflexivity:
For any integer x, x+x=2x, which is even.
Therefore, x0x is false, and the relation is not reflexive.
2. Symmetry:
If xOy, then x+y is odd. But y+x is also odd since addition is commutative.
Therefore, yOx, and the relation is symmetric.
3. Transitivity:
If xOy and yOz, then x+y is odd and y+z is odd. Adding these equations together,
we get x+y+y+z=x+z+2y, which is even.
Therefore, x+z is even, and xOz is false. Thus, the relation is not transitive.
Since the relation xOy is not reflexive and not transitive, it is not an equivalence relation. There are no equivalence classes to describe.
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find the standard matrix of the given linear transformation from ℝ2 to ℝ2. projection onto the line y = 6x
To find the standard matrix of a linear transformation, we need to apply the transformation to the standard basis vectors of the domain and express the results in terms of the standard basis vectors of the codomain.
In this case, the linear transformation is the projection onto the line y=6x, which means that any vector in ℝ2 will be projected onto the closest point on the line.
The standard basis vectors of ℝ2 are (1,0) and (0,1), so let's apply the transformation to each of these vectors:
- (1,0) will be projected onto the point (x, 6x) that lies on the line y=6x. The closest point on the line to (1,0) is when x=0, so the projection of (1,0) onto the line is (0,0). Therefore, the first column of the standard matrix will be (0,0).
- (0,1) will be projected onto the point (x, 6x) that lies on the line y=6x. The closest point on the line to (0,1) is when x=1/6, so the projection of (0,1) onto the line is (1/6,1). Therefore, the second column of the standard matrix will be (1/6,1).
Putting these columns together, we get the standard matrix of the projection onto the line y=6x:
[0 1/6]
[0 1 ]
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Using a trig identity, write x(t)=−(cos(5t))+2sin(5t)using only one cosine function.
x(t)= (b) Using a trig identity, write x(t)=cos(5t)+2sin(5t) using only one cosine function.
x(t)= (c) Using a trig identity, write x(t)=e−3t(−(cos(5t))+2sin(5t)) using only one cosine function in your answer.
x(t)=
A shipping crate is advertised to hold up to 24 cubic feet. If a box in the shape of a rectangular prism measures by 2ft 1 1/2ft by 0.8 ft, how many boxes will the shipping crate hold?
Okay, let's break this down step-by-step:
* The shipping crate holds up to 24 cubic feet of space.
* The box measures:
Width: 2ft 1 1/2in = 2.75ft
Length: 1 1/2ft = 1.5ft
Height: 0.8ft
* To convert to cubic feet:
Width x Length x Height = (2.75ft) x (1.5ft) x (0.8ft) = 4.2 cubic feet
* So each box takes up 4.2 cubic feet of space.
* To fill the 24 cubic feet in the crate:
24 cubic feet / 4.2 cubic feet per box = 5 boxes
Therefore, the shipping crate can hold up to 5 of those rectangular boxes.
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4. Solve the equation for x: 3(x-4) = 9 + 2x
Answer:
X = 21
Step-by-step explanation:
Following the distributive property, on the left side we get 3x-12 = 9 + 2x.
Combine like terms, from 3x, remove 2x and add 12 to 9. This gives us X = 21.
The function f(x) is invertible. Find (f ^-1)' (3) given that f(x) = 5x – 2.
a. 2/15
b. 1/15 c. 15 d. 30
e. -1/15
1. The inverse function, f^(-1)(x) = (x + 2)/5.
2. The derivative of the inverse function, (f^(-1))'(x) = 1/5.
3. (f^(-1))'(3) = 1/5.
We know that a function is invertible if and only if it is one-to-one and onto. In this case, we can easily see that f(x) is a one-to-one function because different inputs always give different outputs, and it is also onto because any real number can be obtained as an output. Therefore, f(x) is invertible.
To find (f^-1)'(3), we need to use the formula for the derivative of the inverse function:
(f^-1)'(3) = 1 / f'(f^-1(3))
First, we need to find f^-1(x). We can do this by solving the equation y = 5x - 2 for x in terms of y:
y = 5x - 2
y + 2 = 5x
x = (y + 2) / 5
Therefore, f^-1(x) = (x + 2) / 5.
Now we can find f'(x):
f(x) = 5x - 2
f'(x) = 5
Next, we need to find f^-1(3):
f^-1(3) = (3 + 2) / 5 = 1
Finally, we can use the formula to find (f^-1)'(3):
(f^-1)'(3) = 1 / f'(f^-1(3)) = 1 / f'(1) = 1 / 5
Therefore, the answer is b) 1/15.
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how many square feet are there in an area of 1.00 sq metres? physical universe
There are approximately 10.764 square feet in an area of 1.00 square metre. This conversion is a mathematical relation and is applicable in the physical universe.
In order to convert square meters to square feet, you can use the following conversion factor: 1 square meter is equal to 10.764 square feet. So, in an area of 1.00 square meters, there are approximately 10.764 square feet. This conversion is applicable in the physical universe.
The use of a unit depends on the context. For instance, the area of a room is measured in meters, but a pencil's length and thickness are measured in centimetres and millimeters, respectively.
As a result, we must convert from one unit to another. We must comprehend the relationship between units before we can comprehend the idea of unit conversion.
We need to convert between units in order to ensure accuracy and prevent measurement confusion. For example, we do not measure a pencil's length in kilometres. In this scenario, it is necessary to convert from kilometres (km) to centimetres (cm). In most cases, multiplicative conversion factors are used to convert one unit to another of the same quantity.
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According to previous studies, 12% of the U.S. population is left-handed. Not knowing this, a high school student claims that the percentage of left-handed people in the U.S. is 14%. The student is going to take a random sample of 1650 people in the U.S. to try to gather evidence to support the claim. Let p be the proportion of left-handed people in the sample. Answer the following. (If necessary, consult a list of formulas.)(a) Find the mean of p.(b) Find the standard deviation of p.(c) Compute an approximation for P(p≥0.14), which is the probability that there will be 14% or more left-handed people in the sample. Round your answer to four decimal places.
The probability approximation for P(p≥0.14) is 0.0495
(a) The mean of the sample proportion p is equal to the population proportion, which is 0.12:
μp = 0.12
(b) The standard deviation of the sample proportion p can be calculated as:
σp = sqrt[(0.12(1-0.12))/1650]
= 0.0121
Therefore, the standard deviation of the sample proportion p is 0.0121.
(c) To compute an approximation for P(p≥0.14), we can use the central limit theorem and assume that the distribution of the sample proportion p is approximately normal.
The mean and standard deviation of the sample proportion have already been calculated in parts (a) and (b).
z = (0.14 - 0.12) / 0.0121
= 1.65
Using a standard normal distribution table or calculator, the probability that a standard normal random variable is greater than or equal to 1.65 is approximately 0.0495.
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find the coefficient of x7 when the following expression is expanded by the binomial theorem. x7 in (3x +4)10 the term
The coefficient of x7 in the expansion of (3x + 4)10 is 53,248,000.
To find the coefficient of x^7 in the expansion of (3x + 4)^10 using the binomial theorem, we need to identify the term that has x^7.
The binomial theorem states that (a + b)^n = Σ (nCk) * a^(n-k) * b^k, where k goes from 0 to n and nCk denotes the binomial coefficient, which is the combination of choosing k items from n.
In our case, a = 3x, b = 4, and n = 10. We need to find the term with x^7, so the power of a (3x) should be 3 (since 3x raised to the power of 3 is x^7). This means the term will have the form:
10C3 * (3x)^3 * 4^(10-3)
Now we calculate the coefficients:
10C3 = 10! / (3! * (10 - 3)!) = 120
(3x)^3 = 27x^{7}
4^7 = 16384
Now, we multiply the coefficients together:
120 * 27 * 16384 = 53,248,000
Therefore, the coefficient of x^7 in the expansion of (3x + 4)^10 is 53,248,000.
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A blueprint for a cottage has a scale of 1:40. One room measures 3.4 m by 4.8 m.
Calculate the dimensions of the room on the blueprint.
can you teach me how to solve it?
Sure, here are the steps to solve this problem:
1. Since the scale of the blueprint is 1:40, it means that any 1 unit on the blueprint represents 40 units on the actual building.
2. The room on the building measures 3.4 m by 4.8 m.
3. So for the dimensions of the room on the blueprint, we divide the measurements by the scale ratio.
4. 1:40 scale means 1 unit = 40 units.
5. So,
3.4 m / 40 units = 0.085 units = 0.08 units (round to 0.08 units)
4.8 m / 40 units = 0.12 units
6. Therefore, the room on the blueprint measures 0.08 units by 0.12 units.
Let me know if this explanation helps or if you have any other questions! I'm happy to help further.
step-by-step:
Room dimensions on building: 3.4 m by 4.8 m
Scale of blueprint: 1 : 40
Step 1) 1 unit on blueprint = 40 units on building
Step 2) 3.4 m / 40 units = 0.085 units (round to 0.08 units)
Step 3) 4.8 m / 40 units = 0.12 units
Step 4) Room dimensions on blueprint = 0.08 units by 0.12 units
Does this help explain the steps? Let me know if any part is still confusing!
a 25 kgkg air compressor is dragged up a rough incline from r⃗ 1=(1.3ı^ 1.3ȷ^)mr→1=(1.3ı^ 1.3ȷ^)m to r⃗ 2=(8.3ı^ 4.4ȷ^)mr→2=(8.3ı^ 4.4ȷ^)m, where the yy-axis is vertical.
The work done in dragging the air compressor up the incline is 4,168.24 J.
What method is used to calculate work done?To solve this problem, we need to determine the work done in dragging the air compressor up the incline.
First, we need to determine the change in height of the compressor:
Δy = y2 - y1
Δy = 4.4 m - 1.3 m
Δy = 3.1 m
Next, we need to determine the work done against gravity in lifting the compressor:
W_gravity = mgh
W_gravity = (25 kg)(9.81 m/s^2)(3.1 m)
W_gravity = 765.98 J
Finally, we need to determine the work done against friction in dragging the compressor:
W_friction = μmgd
where μ is the coefficient of kinetic friction, g is the acceleration due to gravity, and d is the distance moved.
We can assume that the compressor is moved at a constant speed, so the work done against friction is equal to the work done by the applied force.
To find the applied force, we can use the fact that the net force in the x-direction is zero:
F_applied,x = F_friction,x
F_applied,x = μmgcosθ
where θ is the angle of the incline (measured from the horizontal) and cosθ = (r2 - r1)/d.
d = |r2 - r1| = √[(8.3 m - 1.3 m)² + (4.4 m - 1.3 m)²]
d = 8.24 m
cosθ = (r2 - r1)/d
cosθ = [(8.3 m - 1.3 m)/8.24 m]
cosθ = 0.888
μ = F_friction,x / (mgcosθ)
μ = F_applied,x / (mgcosθ)
μ = (F_net,x - F_gravity,x) / (mgcosθ)
μ = (0 - mg(sinθ)) / (mgcosθ)
μ = -tanθ
where sinθ = (Δy / d) = (3.1 m / 8.24 m) = 0.376.
μ = -tanθ = -(-0.376) = 0.376
F_applied = F_net = F_gravity + F_friction
F_applied = F_gravity + μmg
F_applied = mg(sinθ + μcosθ)
F_applied = (25 kg)(9.81 m/s^2)(0.376 + 0.376(0.888))
F_applied = 412.58 N
W_friction = F_appliedd
W_friction = (412.58 N)(8.24 m)
W_friction = 3,402.26 J
Therefore, the total work done in dragging the compressor up the incline is:
W_total = W_gravity + W_friction
W_total = 765.98 J + 3,402.26 J
W_total = 4,168.24 J
So the work done in dragging the air compressor up the incline is 4,168.24 J.
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Determine the margin of error for a 98% confidence interval to estimate the population proportion with a sample proportion equal to 0.70 for the following sample sizes. a. n=100 b. n=200 c. n=250 Click the icon to view a portion of the Cumulative Probabilities for the Standard Normal Distribution table. a. The margin of error for a 98% confidence interval to estimate the population proportion with a sample proportion equal to 0.70 and sample size n=100 is (Round to three decimal places as needed.)
To determine the margin of error for a 98% confidence interval, we need to use the formula: Margin of Error = Z* * Standard Error.
Where Z* is the z-value from the standard normal distribution that corresponds to a 98% confidence level, and Standard Error is the standard deviation of the sampling distribution of proportions.
Using the given table, we can find that the z-value for a 98% confidence level is 2.33, To find the standard error, we use the formula: Standard Error = √((p(1-p))/n).
Where p is the sample proportion and n is the sample size, For part (a), where n=100 and p=0.70, the standard error is: √((0.70(1-0.70))/100) = 0.0463,Therefore, the margin of error is: 2.33 * 0.0463 = 0.1077,
So the margin of error for a 98% confidence interval to estimate the population proportion with a sample proportion equal to 0.70 and sample size n=100 is 0.108 (rounded to three decimal places). For part (b), where n=200 and p=0.70, the standard error is: √((0.70(1-0.70))/200) = 0.0327, Therefore, the margin of error is: 2.33 * 0.0327 = 0.0762
So the margin of error for a 98% confidence interval to estimate the population proportion with a sample proportion equal to 0.70 and sample size n=200 is 0.076 (rounded to three decimal places). For part (c), where n=250 and p=0.70, the standard error is: √((0.70(1-0.70))/250) = 0.0293,
Therefore, the margin of error is: 2.33 * 0.0293 = 0.0681, So the margin of error for a 98% confidence interval to estimate the population proportion with a sample proportion equal to 0.70 and sample size n=250 is 0.068 (rounded to three decimal places).
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answer please, ill give brainliestt!!
Answer:
VU and TU
Step-by-step explanation:
the marked angle between the lines VU and TU is ∠ VUT or ∠ TUV
that is the 2 lines forming the angle between them
Answer:
VU and TU
Step-by-step explanation:
i did this and the rest of it to
find the elasticity of the demand function 2p 3q = 90 at the price p = 15
To find the elasticity of the demand function 2p + 3q = 90 at the price p = 15, we need to first solve for q at that price level.
2(15) + 3q = 90
30 + 3q = 90
3q = 60
q = 20
So, at a price level of p = 15, the quantity demanded is q = 20.
Next, we need to find the derivative of the demand function with respect to price:
dQ/dp = -2/3
Then, we can use the formula for elasticity:
Elasticity = (dQ/dp) * (p/Q)
Elasticity = (-2/3) * (15/20)
Elasticity = -0.5
Therefore, the elasticity of the demand function 2p + 3q = 90 at the price p = 15 is -0.5.
To find the elasticity of the demand function 2p 3q = 90 at the price p = 15, we need to first find the corresponding quantity (q) and then calculate the price elasticity of demand.
Step 1: Solve for q in terms of p
2p 3q = 90
3q = 90 - 2p
q = (90 - 2p) / 3
Step 2: Substitute p = 15 into the equation
q = (90 - 2(15)) / 3
q = (90 - 30) / 3
q = 60 / 3
q = 20
Now we have the point (p, q) = (15, 20) on the demand curve.
Step 3: Differentiate the demand function with respect to p
dq/dp = -2/3
Step 4: Calculate the price elasticity of demand (E)
E = (dq/dp) * (p/q)
E = (-2/3) * (15/20)
E = -0.5
The elasticity of the demand function 2p 3q = 90 at the price p = 15 is -0.5.
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find a third vector x3 that will extend the set {x1,x2} to a basis of r3. 1
a) x1 and x2 cannot span R3 because we would need a third vector in order to do so and it would also have to be linearly independent.
b) In order for X = (x1,x2,x3) we would need all three vectors to be linearly independent such that
ax1+bx2+cx3 = 0 only when a=b=c=0
c) let x3 = (0,0,-1)
Now we place the three vectors into a 3x3 matrix and perform row reductions
1 3 0
1 -1 0
1 4 -1
Add (-1 * row1) to row2
1 3 0
0 -4 0
1 4 -1
Add (-1 * row1) to row3
1 3 0
0 -4 0
0 1 -1
Divide row2 by -4
1 3 0
0 1 0
0 1 -1
Add (-1 * row2) to row3
1 3 0
0 1 0
0 0 -1
Divide row3 by -1
1 3 0
0 1 0
0 0 1
Add (-3 * row2) to row1
1 0 0
0 1 0
0 0 1
So, indeed x3=(0 0 -1) does work and lets X be basis for R3.
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A third vector x3 is [0, 0, 1]
How to find third vector?We need to locate a third vector that is linearly independent of the first two in order to extend the set "x1, x2" to a basis of R3. The cross product is one method for accomplishing this.
The following is how we can locate the third vector, x3, assuming that x1 and x2 are not zeros in R3:
Take the cross result of x1 and x2: x1 × x2.
Verify that the final vector is not zero. x1 x2 can be used as x3 if it is linearly independent of x1 and x2. We must locate another vector if it is zero.
Therefore, if x1 = [1, 0, 0] and x2 = [0, 1, 0], we can find x3 as follows:
x1 × x2 = [0, 0, 1]
[0, 0, 1] can be used as x3 because it is linearly independent of x1 and x2 and has a non-zero cross product with x2. In this manner, the set {x1, x2, x3} is a reason for R3.
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Suppose AB = AC, where B and C are nxp matrices and A is invertible. Show that B=C. Is this true, in general, when A is not invertible?OA. (AB) 1 =B-1A-1OB. (A-1) = (AT) -1OC. A-¹A=IOD. (A-1)-¹=A
In general, when A is not invertible, we cannot guarantee that B = C. Since we can not apply the inverse of A, we cannot cancel out the A matrix on both sides, and thus cannot prove that B = C in such cases.
We are given that AB = AC, where B and C are nxp matrices and A is invertible. We need to show that B = C and discuss whether this is true when A is not invertible.
Step 1: Since A is invertible, we can apply the inverse of A to both sides of the equation AB = AC. We will multiply both sides on the left by A⁻¹.
Step 2: Applying A⁻¹ to both sides, we get A⁻¹(AB) = A⁻¹(AC).
Step 3: Using the associative property of matrix multiplication, we can rearrange the parentheses as follows: (A⁻¹A)B = (A⁻¹A)C.
Step 4: According to the property of the inverse matrix, A⁻¹A = I (the identity matrix). Therefore, we have IB = IC.
Step 5: Since the identity matrix does not change the matrix it is multiplied with, we get B = C.
So, in general, when A is not invertible, we cannot guarantee that B = C. Without the ability to apply the inverse of A, we cannot cancel out the A matrix on both sides, and thus cannot prove that B = C in such cases.
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This table shows outcomes of a spinner with 3 equal sections colored orange, blue, and white. Based on the outcomes, enter the number of times the arrow is expected to land on the orange section if it is spun 20 times.
Orange: 30
Blue: 34
White: 36
marginal and conditional pdfs. the joint density function of two random variables x and y is given by: cx2 xy 2
The marginal PDF of x is a function of x^2, and the conditional PDF of y given x=a is a function of y^2.
What are the marginal and conditional PDFs for the random variables x and y, given their joint PDF cx^2 xy^2?To find the marginal and conditional PDFs, we need to first determine the value of the constant c.
Since this is a joint PDF, it must satisfy the condition that the integral of the PDF over the entire domain equals 1. Therefore, we have:
integral from -inf to +inf of (integral from -inf to +inf of cx^2 * xy^2 dy)dx = 1
Simplifying this expression, we get:
integral from -inf to +inf of (c/3)x^5 dx = 1
Solving for c, we get:
c = 3/[(2/3)*(pi^2)]
Therefore, the joint PDF is:
f(x,y) = (3/[(2/3)*(pi^2)]) * x^2 * y^2
Now, we can find the marginal PDF of x by integrating f(x,y) over y from negative infinity to positive infinity:
f_x(x) = integral from -inf to +inf of f(x,y) dy = integral from -inf to +inf of (3/[(2/3)*(pi^2)]) * x^2 * y^2 dy
Simplifying this expression, we get:
f_x(x) = (3/[(2/3)*(pi^2)]) * x^2 * integral from -inf to +inf of y^2 dy
The integral of y^2 over the entire domain is equal to infinity, but we can still normalize the marginal PDF by dividing it by its integral over the entire domain. Therefore, we have:
f_x(x) = (3/(pi^2)) * x^2, for -inf < x < +inf
Next, we can find the conditional PDF of y given x = a by dividing the joint PDF by the marginal PDF of x evaluated at x = a:
f(y|x=a) = f(x,y) / f_x(a)
f(y|x=a) = [(2/3)(pi^2)] / (3a^2) * y^2, for 0 < y < +inf
Therefore, the marginal PDF of x is a function of x^2, and the conditional PDF of y given x=a is a function of y^2.
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Please help me with this homework
Area = πr²
= π × 8²
= 64π cm²
What % is:
a) 12 out of 20
b) 62 out of 80
What is:
a) 12% of 125
b) 18.3 of 28
a. 12 out of 20 is 60%
b 62 out of 80 is 77.5%
a. 12% of 125 is 15
b. 18.3% of 28 is 5.12.
How to find the percentage of values?The percentage can be found by dividing the value by the total value and then multiplying the result by 100.
Hence, let's find the percentage of the following:
a.
12 / 20 × 100 = 1200 / 20 = 60%
b.
62 / 80 × 100 = 6200 / 80 = 77.5%
Therefore,
12% of 125 = 12 / 100 × 125 = 1500 / 100 = 15
18.3% of 28 = 18.3 / 100 × 28 = 512.4 / 100 = 5.12
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Please answer if you actually know how to .. I really really need it.
The trapezoid ABCD have adjacent angles to be supplementary and values of the variable x = 4 while the measure of m∠D = 78°.
How to evaluate for the angle of the trapezoid.The adjacent angles of the the trapezium are supplementary, so their sum is equal to 180°.
m∠A and m∠D are supplementary so;
14x + 46 + 7x + 50 = 180°
21x + 96° = 180°
21x = 180° - 96° {subtract 96° from both sides}
x = 84°/21
x = 4
m∠D = 7(4) + 50
m∠D = 78°
Therefore, the trapezoid ABCD have adjacent angles to be supplementary and values of the variable x = 4 while the measure of m∠D = 78°.
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Consider the joint density function
f(x,y)= { 16y/x^2 2≤x 0≤y≤1
0 elsewhere
compute the correlation coefficient rhoxy
The marginal mean and variance of X, nor the covariance of X and Y, we cannot find the correlation coefficient.
To find the correlation coefficient, we first need to find the marginal means and variances of X and Y, as well as their covariance.
Marginal mean of X:
E[tex](X) = ∫∫ xf(x,y) dy dx[/tex]
[tex]= ∫2^∞ ∫0^1 x(16y/x^2) dy dx[/tex]
[tex]= ∫2^∞ [8x] dx[/tex]
= ∞ (diverges)
The integral diverges, so we cannot calculate the marginal mean of X.
Marginal mean of Y:
E [tex](Y) = ∫∫ yf(x,y) dy dx[/tex]
[tex]= ∫2^∞ ∫0^1 y(16y/x^2) dy dx[/tex]
[tex]= ∫2^∞ [8/x^2] dx[/tex]
[tex]= 4[/tex]
Marginal variance of X:
Var[tex](X) = E(X^2) - [E(X)]^2[/tex]
[tex]= ∫∫ x^2f(x,y) dy dx - [E(X)]^2[/tex]
[tex]= ∫2^∞ ∫0^1 x^2(16y/x^2) dy dx - ∞[/tex]
[tex]= ∫2^∞ [8x] dx - ∞[/tex]
= ∞ (diverges)
The integral diverges, so we cannot calculate the marginal variance of X.
Marginal variance of Y:
Var[tex](Y) = E(Y^2) - [E(Y)]^2[/tex]
[tex]= ∫∫ y^2f(x,y) dy dx - [E(Y)]^2[/tex]
[tex]= ∫2^∞ ∫0^1 y^2(16y/x^2) dy dx - 16[/tex]
[tex]= ∫2^∞ [8/x^2] dx - 16[/tex]
[tex]= 4 - 16/3[/tex]
[tex]= 4/3[/tex]
Covariance of X and Y:
Cov [tex](X,Y) = E(XY) - E(X)E(Y)[/tex]
[tex]= ∫∫ xyf(x,y) dy dx - ∞(4)[/tex]
[tex]= ∫2^∞ ∫0^1 xy(16y/x^2) dy dx - ∞(4)[/tex]
[tex]= ∫2^∞ [8x] dx - ∞(4)[/tex]
[tex]= ∞ - ∞(4)[/tex]
= -∞ (diverges)
The integral diverges, so we cannot calculate the covariance of X and Y.
Since we cannot calculate the marginal mean and variance of X, nor the covariance of X and Y, we cannot find the correlation coefficient.
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find the area under the standard normal curve between z=−2.95z=−2.95 and z=2.61z=2.61. round your answer to four decimal places, if necessary.
The area under the standard normal curve between z=-2.95 and z=2.61 is approximately 0.9942.
What is curve?
A curve is a geometrical object that is made up of points that are continuous and connected to form a line or a path. It can be defined mathematically by an equation or parametrically by a set of equations that describe the x and y coordinates of points on the curve as a function of a parameter such as time or distance along the curve.
Using a standard normal distribution table, we can find the area under the curve between z=-2.95 and z=2.61 as follows:
Area = Phi(2.61) - Phi(-2.95)
Where Phi(z) represents the cumulative distribution function of the standard normal distribution.
From the standard normal distribution table, we find:
Phi(2.61) = 0.9959
Phi(-2.95) = 0.0017
Therefore, the area under the curve between z=-2.95 and z=2.61 is:
Area = 0.9959 - 0.0017 = 0.9942
Rounding to four decimal places, we get:
Area ≈ 0.9942
Therefore, the area under the standard normal curve between z=-2.95 and z=2.61 is approximately 0.9942.
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Which conditional and its converse are both true?
If x² = 4, then x = 2.
If x= 3, then x² = 6.
If x= 1, then 2x = 2.
If x = 2, then x² = 4.
True or False: For a sample with a mean of M =76, a score of X = 72 corresponds to Z = -0.50. The sample standard deviation is S= 8
True. This can be determined using the formula for calculating the z-score: Z = (X - M) / (S / sqrt(n)), where X is the score, M is the mean, S is the sample standard deviation, and n is the sample size. Substituting the given values, we get:
Z = (72 - 76) / (8 / sqrt(1)) = -0.5
Therefore, a score of X = 72 corresponds to Z = -0.50, given that the sample has a mean of M = 76 and a sample standard deviation of S = 8.
True. Given a sample with a mean (M) of 76 and a sample standard deviation (S) of 8, you can calculate the Z-score for a score of X = 72 using the formula:
Z = (X - M) / S
Z = (72 - 76) / 8
Z = (-4) / 8
Z = -0.50
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A ladybug lands on the end of a clock's second hand
when the hand is pointing straight up. The second
hand is 1 foot long and when it rotates and points
directly to the right, the ladybug is 10 feet above the
ground.
1. How far above the ground is the ladybug after 0, 30,
45, and 60 seconds have passed?
By following cosine law, The ladybug is 1 foot above the ground when the second hand points straight up, 0 feet above the ground after 30 seconds, approximately 0.29 feet above the ground after 45 seconds, and 2 feet above the ground after 60 seconds.
What exactly is cosine law?The cosine law, commonly referred to as the law of cosines, is a rule that explains how a triangle's sides and angles relate to one another. According to this rule, the square of any side is equal to the difference between the squares of the other two sides added together, multiplied by two, and the cosine of the angle between the other two sides. It can be used to solve for missing information and is applicable to any triangles1. It makes the Pythagorean theorem more prevalent.
The second hand of the clock is rotating in a circle like the ladybug does. One foot, or the length of the second hand, makes up the circle's radius. The ladybug is 10 feet above the ground when the second hand is immediately to the right. With a radius of 10 feet, this indicates that the ladybug is travelling in a vertical circle.
The following formula can be used to determine the height above the ground:
radius is equal to (radius× cos(angle)) - distance.
where r is the circle's radius and is the angle formed by the second hand and vertical axis.
Angle = 0 degrees when the second hand is pointing up straight, so:
Distance is equal to 1 - (1× cos(0)) = **1 foot**.
Angle equals 90 degrees after 30 seconds, so:
Distance is equal to 1 - (1 × cos(90)) = 0 ft.
Angle = 135 degrees after 45 seconds, so:
Distance is equal to 1 - (1 ×cos(135)) **0.29 feet**.
Angle equals 180 degrees after 60 seconds, so:
Distance = 1 - (1×cos(180)), which is **2 feet**.
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