Find cos 20 if theta is in the first
quadrant and tan 0 = 40/9

Find Cos 20 If Theta Is In The Firstquadrant And Tan 0 = 40/9

Answers

Answer 1

If the value of the angle θ is 77.32°. Then the value of cos 2θ will be the negative 0.90.

What is trigonometry?

The connection between the lengths and angles of a triangular shape is the subject of trigonometry.

The trigonometric equation is given below.

tan θ = 40/9

tan θ = 4.444

Then the angle θ will be

θ = tan⁻¹(4.444)

θ = 77.32°

Then the value of cos 2θ will be

cos 2θ = cos (2 x 77.32°)

cos 2θ = cos 154.64°

cos 2θ = - 0.9036

cos 2θ ≅ - 0.90

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Related Questions

Solve 10x + 16 2 6x + 20.
A. x29
B. x=9
c. x=1
D. x21


Answers

An equation is formed of two equal expressions. The value of x for which the equation has a solution is 1.

What is an equation?

An equation is formed when two equal expressions are equated together with the help of an equal sign '='.

The solution for 10x+16=6x+20 is,

10x + 16 = 6x + 20

10x - 6x = 20 - 16

4x = 4

x = 1

Hence, the value of x for which the equation has a solution is 1.

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Which equation can be used to solve for x in the following diagram.

Answers

Answer:

C. (3x+12) + x = 180

Step-by-step explanation:

the 2 angles create a straight line which is 180 degrees, so (3x+12) + x = 180

Which graph represents f(x)= | x+3|

Answers

The graph of the function looks like V. And the vertex of the function will be at (-3, 0).

What is a function?

A statement, principle, or policy that creates the link between two variables is known as a function. Functions are found all across mathematics and are required for the creation of complex relationships.

The function is given below.

f(x) = |x + 3|

Then the graph of the function looks like V. And the vertex of the function will be at (-3, 0).

The graph of the function is given below.

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Find the value of cos (2pie/3)

Answers

Answer:

-1/2 or - 0.5

Step-by-step explanation:

[tex]cos (\frac{2\pi }{3}) = cos 120^{o} = -\frac{1}{2}[/tex]

Twenty-five bakery customers were surveyed to determine if they like cake or pie. The results are shown in the Venn diagram.

Circle C and P overlap. Circle C contains 10, circle P contains 8, and the intersection contains 4. Number 3 is outside of the circles.

Given that a randomly chosen customer likes cake, what is the probability that the customer also likes pie?

Answers

The probability that a customer likes cake and pie is 0.16.

What is the probability?

Probability is used to determine the odd that a random event would happen. The odds that the event happens usually lie between 0 and 1.

The probability that a customer likes cake and pie = total number of customers who like cake and pie / total number of customers

4/25 = 0.16

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39. What is the value of x?

Answers

Answer:

x = 15

Step-by-step explanation:

the sum of the exterior angles of a polygon = 360°

sum the 5 exterior angles and equate to 360

5x + 3 + 4x + 8 + 5x + 5 + 6x - 1 + 3x = 360 , that is

23x + 15 = 360 ( subtract 15 from both sides )

23x = 345 ( divide both sides by 23 )

x = 15

In a school,The ratio of the number of boys to the number of girls is 8:5. One quarter of the boys and 1/15 of the girls wear glasses. When another 48 students who wear glasses join the school,the total number of students becomes 216. How many boys wore glasses at first?

Answers

Answer:

hi look here https://www.louisianabelieves.com/docs/default-source/assessment/grade-6-answer-key.pdf?sfvrsn=293b981f_2

Step-by-step explanation:

Which of the following rational functions is graphed below

Answers

Answer:

A.

Step-by-step explanation:

if x≠-4, then the correct answer is

[tex]A. \ F(x)=\frac{1}{x+4}.[/tex]

I need help to find the coordinates

Answers

We can solve by using the substitution method
y=-5/3x+3
y=1/3x-3
They are equal to each other because they are both equal to y
-5/3x+3=1/3x-3
Subtract both sides by 1/3 and subtract 3 from both sides

-5/3x-1/3x=-3-3
-2x=-6

Divide both sides by -2
x=3

Plug in x into one of the equation to solve for y
y=1/3(3)-3
y=1-3
y=-2

(3,-2)

f(x)=x^5+(x+3)^2 which value completed the table

Answers

Answer:

three boys shared D 10,500.00 in the ratio 6:7:8.find the largest share.

The ratio of black bags to blue bags is 5to 3 if there are a total of 10 black bags ,then how many blue bags are there

Answers

Answer:

6

Step-by-step explanation:

We can think of the 10 black bags as 2 sets of 5-black bags (10 divided into groups of 5; 10 / 5 ; is 2 groups/sets). So, we would also have two sets of 3 (3 x 2 = 6), or 6 bags.

5 : 3 = 10 : 6

(multiply both numbers by 2)

Write an equation for a line perpendicular to y = − 4 x + 5 and passing through the point (-12,-4)

Answers

Answer:

[tex]y=\frac{1}{4} x-1.[/tex]

Step-by-step explanation:

1) if the lines are perpendicular, then the second slop is 0.25;

2) the equation of the 2d line is y=0.25x+i, where i - unknown intercept;

3) it is possible to calculate the unknown intercept, if to substitute the given coordinates into the equation y=0.25x+i:

-4=-12*0.25+i; ⇔ i=-1.

4) finally, the required equation is:

[tex]y=\frac{1}{4} x-1.[/tex]

vertex of y = −2(x−4)2 + 3
and identify it as a minimum or a maximum.

Answers

An equation is formed of two equal expressions. The vertex of the equation y=-2(x-4)²+3 will lie at (4,3).

What is an equation?

An equation is formed when two equal expressions are equated together with the help of an equal sign '='.


If we plot the graph of y=-2(x-4)²+3, then the vertex of the graph will lie at (4,3).

Hence, the vertex of the equation y=-2(x-4)²+3 will lie at (4,3).

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The three dot plots together are the scores of teenagers in three samples from this population. Which of the three samples is most representative of the population? Explain how you know.

Answers

The sample that is most representative of the population is: sample 3.

What is a Representative Sample of a Population?

A representative sample of a population can be defined as a subset of that particular population that reflects almost or same characteristics of the main population such as the shape, center, and spread.

From the three dot plots given, the one that has almost same pattern and characteristics is sample 3 considering it has almost similar spread and shape.

Thus, the most representative sample is: sample 3.

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please help will give branliest

Answers

This proof was correctly started by both eric and maggie.

The next step in the proof is to set the right side of the equations equal.

This would be done by the transitive property of equality.

What is a Mathematical Proof?

This refers to the use of inference to make an argument to show the logical conclusion to a set of assumptions.

Based on the given diagram that shows Triangle XYZ and the mathematical proof that both Eric and Maggie are trying to prove, they both give the correct proof and the next step was to make the right side of the equations equal.

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Answer:

1: both

2: set the right side

3: transitive property

Step-by-step explanation:

got it right on plato :)

What is the directrix of the parabola defined by `(1)/(4)(y + 3) = (x − 2)^2`?

Answers

The directrix of the parabola is [tex]y = \frac {-49}{16}[/tex]

How to determine the equation of the directrix?

The parabola equation is given as:

[tex]\frac 14(y + 3) = (x -2)^2[/tex]

A parabola is represented as:

[tex]4p(y - k) =(x -h)^2[/tex]

By comparing both equations, we have:

4p = 1/4 ==> p = 1/16

-k= 3 ==> k = -3

The directrix is represented as:

y = k - p

So, we have:

[tex]y = -3 - \frac 1{16}[/tex]

Take the LCM

[tex]y = \frac {-16 * 3- 1}{16}[/tex]

Evaluate

[tex]y = \frac {-49}{16}[/tex]

Hence, the directrix of the parabola is [tex]y = \frac {-49}{16}[/tex]

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Y
5
What is the equation of the graphed line written in
standard form?
4
3
2
1
O 2x + 3y = -6
O 2x + 3y = 6
O y=-{x-2
O y=x-2
5-4-3-2 12
1 2 3 4 5
x
2
-3

Answers

The equation of the graphed line 2x + 3y = -6 written in standard form is,[tex]\rm y= -\frac{2}{3}x -2[/tex] and for line 2x + 3y = 6 will be,[tex]\rm y = \frac{-2}{3}x+2[/tex]

What is the equation?

A mathematical statement consisting of an equal symbol between two algebraic expressions with the same value is known as an equation.

a) 2x + 3y = -6

The line in which the standard form is found as;

Ax + By + C = 0

The typical form of a slope intercept is

y = mx+c

where m denotes the slope and b the line's y-intercept.

[tex]3y= -6-2x\\\\ y=\frac{-6-2x}{3}\\\\ y= -\frac{2}{3}x -2[/tex]

To obtain the slope standard form, we rewrite. The obtained equation is in the form of the slope-intercept.

b) 2x + 3y = 6

The line in which the standard form is found as;

Ax + By + C = 0

The typical form of a slope intercept is

y = mx+c

where m denotes the slope and b the line's y-intercept.

[tex]\rm 3y= 6-2x \\\\ y= \frac{6-2x}{3} \\\\ y = \frac{-2}{3}x+2[/tex]

Hence, The equation of the graphed line 2x + 3y = -6 written in standard form is,[tex]\rm y= -\frac{2}{3}x -2[/tex]

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What is the equation of the graphed line written in standard form?

2x + 3y = -6, 2x + 3y = 6

Summary:

a. The equation of the graphed line 2x + 3y = -6 written in standard form is y= -2/3 x -2.

b. The equation of the graphed line 2x + 3y = 6 written in standard form is y= -2/3 x +2.

find the solution set. 7x^2-5x-2=0

Answers

Answer:

x

=

 

b

±

b

2

4

a

c

2

a

, we get that

x

=

2

,

0.6

Explanation:

Rearrange the equation so that it becomes:

5

x

2

+

7

x

6

=

0

The quadratic formula is:

x

=

b

±

b

2

4

a

c

2

a

In our equation above,

a

=

5

b

=

7

c

=

6

Plugging these values into the quadratic equation gives:

x

=

7

±

7

2

4

(

5

)

(

6

)

2

(

5

)

x

=

7

±

49

+

120

10

x

=

7

±

169

10

x

=

7

±

13

10

x

=

2

,

0.6

Find slope and intercept of the line 3x - 2y - 7 = 0

Answers

The slope and intercept of the line 3x - 2y - 7 = 0 are -1.5 and -3.5 respectively

How to determine the slope and the intercept?

The equation of the line is given as:

3x- 2y - 7 = 0

Add 7 to both sides

3x - 2y = 7

Subtract 3x from both sides

-2y = -3x + 7

Divide both sides by -2

y = -1.5x -3.5

A linear equation is represented as:

y = mx  + c

Where m represents slope and c represents the intercept

By comparison;

m = -1.5 and c = -3.5

Hence, the slope and intercept of the line 3x - 2y - 7 = 0 are -1.5 and -3.5 respectively

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9.80 x 10^-3 + 1.60 x 10^-4

Answers

Answer:

0.00016098

Step-by-step explanation:

First multiply 9.8 by 10^-3 which equals 0.0098

Then add 0.0098 to 1.6 which equals 1.6098

Then multiply 1.6098 by 10^-4 which equals 0.00016098

Therefore, 0.00016098 is your answer

Factor out the GCF from the given polynomial.
14x-2

Answers

The answer is 1 is it helpful?

Answer:

2(7x-1)

Step-by-step explanation:

14 & 2 gcf 2 factor and wal lah!

which graph represents the linear function y=-5x+2

Answers

The answer would be the second picture. Also, if you have any questions like these you can go on desmos and put in the equation to see the answer. Hope this helps!

What is the value of

(1/8)^-1/3

PLEASE I NEED THE AWNSER QUICK PLEASE AND TY

Answers

Answer:

2.66666666667

Step-by-step explanation:

(1/8)^-1/3 means 1/8 to the -1/3 power, which equals 2.66666666667. So the answer is 2.66666666667.

Drag the tiles to the correct boxes to complete the pairs.
Match the systems of equations with their solution sets.
y + 12 = 1² + s
s+y = 3
y - 17 = 12 -9r
- + y = 1
Solution Set
(2,3) and (8,9)
(-2,3) and (7-6)
(-2,5) and (3,-5)
(-5,8) and (3,0)
y-15 = -12 + 4s
=+y=1
y + 5 = 1²-3r
2s + y = 1
Linear-Quadratic System of Equations

Answers

Answer:

y+12=1+s = (-5,8)(3,0)

y-17=12-9r = (2,3)(8,9)

y-15=-12+4x = (-2,3)(7,-6)

y+5=x-3x = (-2,5)(3,-5)

three students measured the width of the whiteboard. Reggie got 2, Jackson got 72, and Pete got 6. The teacher said they were all correct. Draw lines to match each student with the unit he was using.​

Answers

Answer:

2 yards ; 6 feet ; 72 inches ;

Step-by-step explanation:

2:6:72

1:3:12

1:3 is the ratio of Yards -> Feet

3:12 is the ratio of Feet -> Inch.

6ft = Pete

2 yards = Reggie

72 inches = Jackson

-- Gage Millar, Algebra 1/2 Tutor (Pending Pre-Calc Tutor)

Is this sequence arithmetic? Why or why not?

11, 11, 11, 11, 11

Answers

no because it’s the same number over and over, if it were arithmetic the next number would be x added to 11 to get a2

Dean Field is a bookkeeper for a retail shop. He is super excited about his upcoming two-week vacation to Hawaii. His flight leaves to Honolulu at 7pm on Friday. At 4:45pm on Friday he realizes the company’s trial balance is a mess and it does not balance. He places random numbers in the General Ledger system to make it balance and leaves the office to catch his flight. He knows he can correct the situation when he returns from his vacation. What are your thoughts about this case?

Answers

The fact that Dean Field places random numbers in the general ledger system to make it balance and leaves the office to catch his flight is wrong.

What is a ledger?

It should be noted that a ledger simply means a record of the balance of each of the accounts of a business.

In this case, when he realizes the company’s trial balance is a mess and it does not balance, he should have waited and ensured that he re calculated it and made it balance.

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1. IDENTIFY THE DIFFERENT PARTS OF THE THERMOMETER 100 20 10 30 AN 000​

Answers

they are different temperatures

A) 16/12
B) 12/20
C) 12/16
D) 16/20

Answers

Answer:

COA opposite/ adjacent

16/12

A

Given a polynomial function f(x) = –x2 + 2x + 1 and an exponential function g(x) = 2x, what key features do f(x) and g(x) have in common?

A.)Both f(x) and g(x) decrease over the interval of [1 , ∞).
B.) Both f(x) and g(x) have the same range of (–∞, 2).
C.) Both f(x) and g(x) have the same x-intercept of (–1, 0).
D.)Both f(x) and g(x) have the same y-intercept of (0, 1).

Answers

The only key feature that these functions have in common is that they have the same y-intercept. So the correct option is D.

What do these functions have in common?

Here we have the functions:

[tex]f(x) = -x^2 + 2x + 1\\\\g(x) = 2^x[/tex]

f(x) is quadratic, and g(x) is exponential.

Notice that the exponential function has a positive base, so it is increasing. For the quadratic equation we can see a negative leading coefficient, so it opens downwards.  So first and second options are false.

Also, g(x) never intersects the x-axis, so third option is false.

Finally, the y-intercepts of the given functions are:

[tex]f(0) = -0^2 + 2*0 + 1 = 1\\\\g(0) = 2^0 = 1[/tex]

So the y-intercepts are equal, meaning that the correct option is D.

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Answer:

Both f(x) and g(x) have the same y-intercept of (0, 1).

Step-by-step explanation:

I got it right on the test.

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