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Andrew [12]
2 years ago
10

Please help. first one in gets brainliest along with 5* and thanks.

Mathematics
2 answers:
Aloiza [94]2 years ago
6 0
18-x
18/2=6
18-5=13 I’m not sure
PilotLPTM [1.2K]2 years ago
4 0

Answer:

18-x

18/2=6

18-5=13

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What is the surface area of the cylinder?
Murrr4er [49]
The answer is B. 128.1
7 0
3 years ago
Cos(-170°) = _____<br><br> -cos10°<br> cos10°<br> cos(-10°)
ikadub [295]

<em>The right answer for:</em>

<em>cos(-170°) = _____</em>

<em>is:</em>

<em>-cos10°</em>

<h2>Explanation:</h2>

The cosine function is an even function, which means that for every point (x,y) on the graph of y=cos(x) then the point (-x,y) also lies on the graph of the function. In other words, we can write:

cos(-170^{\circ})=cos(170^{\circ})

But:

170^{\circ}=180^{\circ}-10^{\circ}

So:

cos(170^{\circ})=cos(180^{\circ}-10^{\circ})

By property:

cos(a-b)=cosacosb+sinasinb \\ \\ a=180^{\circ} \\ \\ b=10^{\circ} \\ \\ cos(170^{\circ} )=cos(180^{\circ} -10^{\circ})=cos180^{\circ} cos10^{\circ} +sin180^{\circ} sin10^{\circ} \\ \\  cos(170^{\circ})=-cos(10^{\circ})+0 \\ \\ \boxed{cos(170^{\circ})=-cos(10^{\circ})}

<h2>Learn more:</h2>

Trigonometric functions: brainly.com/question/2680050

#LearnWithBrainly

4 0
3 years ago
Does the equation x^2+y=144 define y as a function of x?
11Alexandr11 [23.1K]

The given equation is

x^2 + y = 144

First we solve for y, and for that, we have to islolate y, that is

y= 144-x^2

And it pass the vertical line test. So here y is a function of x .

So we can define the given equation as y as a function of x .

8 0
2 years ago
the perimeter of a regular pentagon is 41.5 cm. Write and solve an equation to determine the length of each side of the pentagon
ser-zykov [4K]
It would be 41.5 divided by 5 because a pentagon has 5 sides
6 0
3 years ago
Read 2 more answers
Please help solve the problem below.
ivann1987 [24]

Answer:

1. x = 2

2. x = 5

3. x = 8

4. x = 28

5. x = 13

6. x = 11

7. x = 0

8. x = 72

9. x = 6

10. x = 38

Step-by-step explanation:

hope that helps!

1. subtract 6 on both sides

2. add 3 on both sides

3. divide both sides by 2

4. multiply both sides by 2

5. add 8 on both sides

6. subtract 9 on both sides

7. add 5 on both sides

8. multiply both sides by 6

9. divide both sides by 4

10. add 18 on both sides

3 0
3 years ago
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