If it takes Laine 4 hours to wash the windows, Leslie 5 hours to wash the same windows, and Lance 6 hours to wash the windows, how long would it take them all working together?
.8 hours
6 hours
1.6 hours
3.2 hours

Answer:

800m

Step-by-step explanation:

Answer:

799,9999 is gearter

Step-by-step explanation:

ok is that ur answer to your question

Answer: 1 book= 8 dollars

Step-by-step explanation:

9 x8= 72 meaning that 72 + 72 = 144 so 1 book must equal 8 dollars

The correct option is D. Normal with mean 60 and a standard deviation of 2.

A sampling distribution is a probability distribution derived from taking numerous samples of a specific size from a population. The characteristics of the sampling distribution are determined by the sample size and how the samples are collected.

Standard deviation is the amount by which the observations in a dataset deviate from the mean. It is a measure of variability that reflects the degree to which data is spread around the mean.

The higher the standard deviation, the more spread out the data is.What is the formula for the standard deviation of a sampling distribution?σ_x = σ/√nWhere,σ_x is the standard deviation of the sampling distribution σ is the population standard deviationn is the sample size

To calculate the standard deviation of the sampling distribution, we must first identify the population standard deviation, which is 10 in this case, and the sample size, which is 25.σ_x = σ/√nσ_x = 10/√25σ_x = 2Therefore, the standard deviation of the sampling distribution is 2.

The mean of the sampling distribution is equal to the population mean, which is 60. Thus, the sampling distribution is normal with a mean of 60 and a standard deviation of 2.

Therefore, option D is correct.Normal distribution has a shape that is symmetrical and bell-shaped with a mean of 0 and a standard deviation of 1. The curve's tail will continue indefinitely in both directions.

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The correct answer is option D. Normal with mean 60 and a standard deviation of 2.

A random sample of size 25 is to be taken from a population that is normally distributed with a mean 60 and a standard deviation 10.

The average of the observations in our sample is to be computed.

The sampling distribution is Normal with a mean 60 and a standard deviation of 2.

What is the sampling distribution? When we take the average of a large number of samples drawn from a normally distributed population, the resulting distribution is referred to as a sampling distribution.

Because the population is normally distributed, the mean of the sampling distribution will be the same as the population mean, which is 60.

The standard deviation of the sampling distribution is determined by dividing the population standard deviation by the square root of the sample size, therefore the standard deviation of the sampling distribution is 2.

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Answer:

15

Step-by-step explanation:

Answer:

15 cookies

Step-by-step explanation:

10 cookies is equivalent to 2 scoops of flour.

You need to find how many cookies they can make with just 1 scoop of flour.

So, to do that, you'd need to do 10/2, which is 5.

10 represents the number of cookies, and 2 represents the scoops of flour. (5 represents the number of cookies you can make with 1 scoop of flour.)

This will work with any certain amount of flour, just use the equation 5 times X, where X is the amount of flour.

In this certain problem, they gave us the scoops of flour.

Replace X with 3.

3 times 5 = 15.

15 cookies.

Question:

Rewrite the function to reveal when sales of compact discs and $0.

Answer:

The cost in 2010 is $0

Step-by-step explanation:

Given

[tex]C(x) = -2x^2 + 38x + 40[/tex]

Required

Find x when [tex]C(x) = 0[/tex]

This gives:

[tex]C(x) = -2x^2 + 38x + 40[/tex]

[tex]-2x^2 + 38x + 40=0[/tex]

Expand

[tex]-2x^2 + 40x -2x+ 40=0[/tex]

Factorize:

[tex]-2x(x - 20) -2(x- 20)=0[/tex]

[tex](-2x - 2)(x- 20)=0[/tex]

Solve for x

[tex]-2x-2=0\ or\ x - 20 = 0[/tex]

[tex]x = -1\ or\ x = 20[/tex]

x represents time.  So, it cannot be negative.

[tex]x = 20[/tex]

20 years after 1990 is: 2010. Hence, the cost in 2010 is $0

Answer:

I believe

D. Pyramid

Is the answer I did it in 6th or 7th grade

Step-by-step explanation:

Square is flat so no height.  

Line segment is a flat line so no height  

point is a literal dot  

pyramid is a 3d figure so it would have all of the attributes

We both helped right?

Answer:

Pyramid

Step-by-step explanation:

Square is flat so no height.

Line segment is a flat line so no height

point is a literal dot

pyramid is a 3d figure so it would ahve all of the attributes

Using Richardson's extrapolation the improved approximation of the first derivative at x = 0 is  -4.94543.

A formula of order 4 for approximating the first derivative of a function f gives two values: f'(0) = -4.50557 for h = 1 and f'(0) = 2.09702 for h = 0.5.

To obtain a better approximation using Richardson's extrapolation, we can use these two values and apply the following formula:

f'(0) = f'(0) + (f'(0) - f'(0)) / (h^p - 1)

where p is the order of the formula (in this case, p = 4).

Using the given values, we have:

f'(0) = 2.09702 + (2.09702 - (-4.50557)) / ((0.5/1)^4 - 1)

Simplifying the expression:

f'(0) = 2.09702 + 6.60259 / (0.0625 - 1)

f'(0) = 2.09702 + 6.60259 / (-0.9375)

f'(0) = 2.09702 - 7.04245

f'(0) ≈ -4.94543

Therefore, the improved approximation of the first derivative at x = 0 using Richardson's extrapolation is f'(0) ≈ -4.94543.

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Answer:

(x+2)^2 +(y-4)^2

Step-by-step explanation:

correct answer: ( x - ( -2 ) ) ² + ( y - 4 ) ² = 36

so put in -2 for the first blank, 4 for the second and 36 for the last blank!

btw it can be simplified to (x+2)² + (y-4)² = 6²

but thats not what theyre asking for ^^

Answer : 1/2 gallon

Explanation:

There were a total of 5 gallons collected, as the question states.

There are 3 x's above 1/4, 2 x's above 3/8, 4 x's above 5/8 and 1 x above 1. This is a total of

3+2+4+1 = 10 x's. This means there were 10 trees.

If 5 gallons is evenly distributed among 10 trees, this would give us the ratio 5/10, which simplifies to 1/2 gallon per tree.

....this answer is not from me. The same question was asked on brainy and I've copy pated it, it is the right answer tho. Credit goes to "MsEHolt" for answering.

Answer:

See Explanation

Step-by-step explanation:

The question is incomplete as the image that illustrates the scenario is not given.

However, I can deduce that the question is about a right-angled triangle.

So, I will give a general explanation on how to find each of the side of the triangle, given a side and an angle.

For triangle A (solve for b)

Using cosine formula.

[tex]\cos \theta = \frac{Adjacent}{Hypotenuse}[/tex]

[tex]\cos 60= \frac{5}{b}[/tex]

Make b the subject

[tex]b= \frac{5}{\cos 60}[/tex]

For triangle B (solve for b)

Using cosine formula.

[tex]\sin \theta = \frac{Opposite}{Hypotenuse}[/tex]

[tex]\sin 60= \frac{b}{5}[/tex]

Make b the subject

[tex]b = 5\sin 60[/tex]

For triangle C (solve for b)

Using cosine formula.

[tex]\tan \theta = \frac{Opposite}{Adjacent}[/tex]

[tex]\tan 60= \frac{b}{5}[/tex]

Make b the subject

[tex]b = 5\tan 60[/tex]

Answer:

Did you get the answer If so please give it to me.

Step-by-step explanation:

Answer:

164

Step-by-step explanation:

15(5)

2(7)

15(5)

add em up

75 plus 14 plus 75

Given Info : What is the difference of the value of Lily's expression , 6x-3, when x=5 and the value of Pedro's expression when x=5 .

To Find :- Show or explain how you got your answer.

Solution:-

The expression is 6x-3 , and we need to find its value at x = 5 , On putting x =5 we have

6*5-3 = 30-3 = 27.

This value will come same in case of Pedro, therefore our required answer is 5

Answer:

Step-by-step explanation:

volume of cone formula: V = 1/3 πr²h

r = 1/2 d

r = 1/2 (17.5)

r = 8.75 in

V = 1/3 (π8.75²)(18.5)

V = 1483.26 in²

Answer:

3 dots

Step-by-step explanation:

This should be correct due to there only being 3 100% on the table

a. There are 5 degrees of freedom in the data

b. The critical value represents the value beyond which the test statistic must exceed to reject the null hypothesis.

In a chi-square test, the degrees of freedom (df) can be calculated as (number of categories - 1). In this case, there are six categories, so the degrees of freedom would be:

df = 6 - 1

df = 5

Therefore, there are 5 degrees of freedom.

To find the critical value of chi-square at a significance level of 0.02 and 5 degrees of freedom, you can refer to a chi-square distribution table or use a statistical calculator. The critical value represents the value beyond which the test statistic must exceed to reject the null hypothesis.

For a significance level of 0.02 and 5 degrees of freedom, the critical value of chi-square is approximately 9.837 (rounded to 3 decimal places).

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The 95% confidence interval for the mean length difference between two-year-old flounder and one-year-old flounder is (8.03 mm, 21.53 mm).

Using a t-table or calculator, we can find the t-value corresponding to a 95% confidence level and 109 degrees of freedom. The t-value is approximately 1.984.

Substituting the values into the formula:

CI = (134.96 - 120.18) ± 1.984 * √[(18.08² / 110) + (27.41² / 138)]

CI = 14.78 ± 1.984 * √[(327.2064 / 110) + (752.6681 / 138)]

CI = 14.78 ± 1.984 * √[2.9746 + 5.4557]

CI = 14.78 ± 1.984 * √8.4303

CI = 14.78 ± 1.984 * 2.9015

CI = 14.78 ± 5.7519

CI = (8.0281, 21.5319)

The 95% confidence interval for the mean length difference between two-year-old flounder and one-year-old flounder is (8.03 mm, 21.53 mm).

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T is diagonalizable, and the matrix P = [(1, -3), (1, 1)] is the transformation matrix that diagonalizes T. The diagonal matrix D is D = [(7.5, 22.5), (2.5, 7.5)].

To find the eigenvalues and eigenvectors of the linear operator T: R2 → R2 given by T(x, y) = (3x + 3y, x + 5y), we can follow the steps outlined in the subtasks.

Subtask (1): Finding Eigenvalues and Eigenvectors

To find the eigenvalues, we need to solve the equation (T - λI)v = 0, where λ is the eigenvalue, I is the identity matrix, and v is the eigenvector.

Let's set up the equation:

(T - λI)v = 0

[(3x + 3y) - λx, (x + 5y) - λy] = [0, 0]

Expanding the equations, we get:

(3 - λ)x + 3y = 0 ...(1)

x + (5 - λ)y = 0 ...(2)

For nontrivial solutions (v ≠ 0), the determinant of the coefficient matrix must be zero. So we have:

[tex](3 - \lambda)(5 - \lambda) - 3 = 0\\(15 - 8 \lambda + \lambda^2) - 3 = 0\\ \lambda^2 - 8 \lambda+ 12 = 0\\( \lambda - 6)( \lambda - 2) = 0[/tex]

Solving for λ, we find two eigenvalues:

λ1 = 6 and λ2 = 2

For each eigenvalue, we need to find the corresponding eigenvectors by substituting back into equations (1) and (2).

For λ1 = 6:

From equation (1): (3 - 6)x + 3y = 0

-3x + 3y = 0

x = y

So, the eigenvector corresponding to λ1 = 6 is v1 = (1, 1).

For λ2 = 2:

From equation (1): (3 - 2)x + 3y = 0

x + 3y = 0

x = -3y

So, the eigenvector corresponding to λ2 = 2 is v2 = (-3, 1).

Subtask (2): Basis for Each Eigenspace

The eigenspace corresponding to an eigenvalue λ is the set of all eigenvectors associated with that eigenvalue. To find a basis for each eigenspace, we can take linearly independent eigenvectors.

For λ1 = 6, the eigenspace is spanned by the eigenvector v1 = (1, 1).

For λ2 = 2, the eigenspace is spanned by the eigenvector v2 = (-3, 1).

Subtask (3): Maximum Set of Linearly Independent Eigenvectors

The maximum set S of linearly independent eigenvectors can be formed by taking one eigenvector from each distinct eigenvalue. In this case, S = {v1, v2} = {(1, 1), (-3, 1)}.

Subtask (4): Diagonalizability

To check if T is diagonalizable, we need to determine if there exists a basis for R2 consisting of eigenvectors of T. If we can find a basis consisting of eigenvectors, then T is diagonalizable.

Since we have a maximum set of linearly independent eigenvectors, S = {(1, 1), (-3, 1)}, we can form a matrix P with these eigenvectors as columns:

P = [(1, -3), (1, 1)]

To find the diagonal matrix D, we use the formula D = P^(-1)[T]P, where [T] is the matrix representation of T in the usual basis.

Calculating P^(-1):

P^(-1) = 1/4 [(1, 3), (-1, 1)]

Now, calculating D:

D = P^(-1)[T]P

= 1/4 [(1, 3), (-1, 1)][(3, 3), (1, 5)][(1, -3), (1, 1)]

= 1/4 [(1, 3), (-1, 1)][(6, 18), (8, 28)]

= 1/4 [(1, 3), (-1, 1)][(6, 18), (8, 28)]

= 1/4 [(30, 90), (10, 30)]

= [(7.5, 22.5), (2.5, 7.5)]

So, the matrix representation of T, [T], in the basis of eigenvectors is D = [(7.5, 22.5), (2.5, 7.5)].

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Answer:

1)  regular price ⇒ $X

Sale price:75,24

Regular price: 100, X

2) The Ratio of the numbers in the first column equals the to ratio

of numbers in the second one

so.. [tex]\frac{75}{124}=\frac{100}{x} \\[/tex]

X=100 ×24/75

X=$32

Regular price-sale price=32-24=$8

hope it helps...

Answer:

(3)

Step-by-step explanation:

The total amount that will be in the account 40.00 years from today, considering the annual deposits of $6,460.00 for 21.00 years and an annual interest rate of 14.00%, will be approximately $6,120,433.84.

Derek plans to deposit $6,460.00 per year for 21.00 years into an account with an annual interest rate of 14.00%. The first deposit will be made next year.

To calculate the total amount in the account 40.00 years from today, we need to consider the annual deposits, the interest earned, and the compounding effect over the years.

The annual deposit is $6,460.00, and the duration of deposits is 21.00 years.

Therefore, the total amount of deposits made over the 21.00 years will be 21.00 × $6,460.00 = $135,660.00.

To calculate the future value of the deposits and the interest earned, we can use the compound interest formula:

Future Value = Principal × [tex](1 + interest\, rate)^{number\, of\, periods}[/tex]

In this case, the principal is $135,660.00, the interest rate is 14.00%, and the number of periods is 40.00 years.

Future Value = $135,660.00 × [tex](1 + 0.14)^{40}[/tex]

Future Value = $135,660.00 × [tex](1.14)^{40}[/tex]

Future Value = $135,660.00 × 45.094

Future Value = $6,120,433.84

Therefore, the total amount that will be in the account 40.00 years from today, considering the annual deposits of $6,460.00 for 21.00 years and an annual interest rate of 14.00%, will be approximately $6,120,433.84.

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Answer:

w=8

Step-by-step explanation:

[tex]72=7w+2w\\72=9w\\\frac{72}{9} =w\\w=8[/tex]

proof:

[tex]72=7(w)+2(w)\\72=7(8)+2(8)\\72=56+16\\72=72[/tex]

Answer:

Simplest-9w=72, w=8

Step-by-step explanation:

7w+2w=9w

72/9=8

w=8

Answer:

What do you need help with?

What doth thee needeth help with?

您需要什么？

The theorem states that for positive natural numbers a and n, the statements "GCD(a, n) = 1" (a and n are relatively prime), "a is not a zero divisor," and "there exists a natural number b such that ab ≡ 1 (mod n)" are all equivalent.

The theorem establishes the equivalence of three statements concerning positive natural numbers a and n. Firstly, if the greatest common divisor (GCD) of a and n is 1, it indicates that a and n are relatively prime.

This means that they have no common factors other than 1.

The second statement states that if a is not a zero divisor, then it implies that a multiplied by any nonzero element b is not equal to zero. In other words, a does not "annihilate" any nonzero element in multiplication.

Lastly, the theorem asserts that if there exists a natural number b such that ab ≡ 1 (mod n), it signifies the existence of a multiplicative inverse of a modulo n.

This means that a and n have a modular inverse, which is a natural number that, when multiplied by a, gives a remainder of 1 when divided by n.

The theorem shows that these three statements are equivalent, meaning that if one statement is true, then the other two statements will also hold.

The proof of this theorem involves establishing the logical connections between these statements and demonstrating that they are always true under the given conditions.

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Answer:

I think it's 5

Step-by-step explanation:

I am not really sure but I tried I guess

For centrifugal, the best-efficiency operating point for a 300-mm size within this homologous series, and estimate the corresponding efficiency can be calculated as follows:

Given data: Specific speed (Ns) = 1.1Speed of motor (N) = 2400 rpm Best efficiency of 400 mm size pump within this series is 85%The flow rate (Q) at best efficiency is 500 L/s The head added (H) by the pump at best efficiency is 895 m We are required to find the best efficiency and operating point of a 300-mm size within this homologous series.

As per affinity laws of pump, the performance of pumps that are geometrically similar but of different sizes can be compared by the equation:N1/Q1 = N2/Q2 (speed and flowrate relationship)H1/H2 = (D1/D2)² (head and diameter relationship)P1/P2 = (D1/D2)³ (power and diameter relationship)Where,N1 and N2 are speeds of the pumpsQ1 and Q2 are the flowrates of the pumpsH1 and H2 are the heads added by the pumpsD1 and D2 are the diameters of the pumpsP1 and P2 are the power input of the pumps

This information can be used to estimate the best efficiency operating point of the 300-mm pump. Let's assume that the efficiency of the 300-mm pump at the best efficiency operating point is η.We can use the pump affinity laws to estimate the efficiency of the 300-mm pump as follows:η1/η2 = (D1/D2)³ (efficiency and diameter relationship)η1 = 85% (best efficiency of 400-mm pump)η2 = η (efficiency of 300-mm pump)D1 = 400 mmD2 = 300 mm∴ η1/η2 = (D1/D2)³η2 = η1 / (D1/D2)³= 85% / (400/300)³= 69.7%

Therefore, the best efficiency of the 300-mm pump is 69.7%.Answer: The best-efficiency operating point for a 300-mm size within this homologous series is a flow rate of 500 L/s and a head of 677 m. The corresponding efficiency is 69.7%.

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9514 1404 393

Answer:

  a) ∆RLG ~ ∆NCP; SF: 3/2 (smaller to larger)

  b) no; different angles

Step-by-step explanation:

a) The triangles will be similar if their angles are congruent. The scale factor will be the ratio of any side to its corresponding side.

The third angle in ∆RLG is 180° -79° -67° = 34°. So, the two angles 34° and 67° in ∆RLG match the corresponding angles in ∆NCP. The triangles are similar by the AA postulate.

Working clockwise around each figure, the sequence of angles from lower left is 34°, 79°, 67°. So, we can write the similarity statement by naming the vertices in the same order: ∆RLG ~ ∆NCP.

The scale factor relating the second triangle to the first is ...

  NC/RL = 45/30 = 3/2

__

b) In order for the angles of one triangle to be congruent to the angles of the other triangle, at least one member of a list of two of the angles must match for the two triangles. Neither of the numbers 57°, 85° match either of the numbers 38°, 54°, so we know the two triangles have different angle measures. They cannot be similar.

Answer:

Its c

Step-by-step explanation:

Answer:

c

Step-by-step explanation:

Answer:

the answer is B on USA Prep

Step-by-step explanation:

"A potential outlier at (50, 12)" is the statement that best describes the data shown in the scatter plot.

A straight line that minimizes the gap between it and certain data is called a line of best fit. In a scatter plot containing several data points, a relationship is expressed using the line of best fit. It is a result of regression analysis and a tool for forecasting indicators and price changes.

Given:

The scatter plot shows the relationship between backpack weight and student weight.

From the given choices:

An outlier is a value that nowhere near the range of the data set.

From the scatter plot:

A potential outlier at (50, 12).

Therefore, a potential outlier at (50, 12).

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Answer:36.36%

Step-by-step explanation:

%change=100 X (final-inital value) divided by initial