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2 years ago

I need help plzzzzzz

Mathematics

1 answer:

sammy [17]2 years ago

3 0

the answer is 0 Numble D

it help you

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Makayla was training for a 2k run. it was tiring, and she had to stop and walk to the finish line.if she had run 650 meters out

jonny [76]

She ran 21 inches. Thats your answer. sorry if im wrong

7 0

3 years ago

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If x = a cosθ and y = b sinθ , find second derivative

Olin [163]

I'm guessing the second derivative is for <em>y</em> with respect to <em>x</em>, i.e.

$\dfrac{\mathrm d^2y}{\mathrm dx^2}$

Compute the first derivative. By the chain rule,

$\dfrac{\mathrm dy}{\mathrm dx}=\dfrac{\mathrm dy}{\mathrm d\theta}\dfrac{\mathrm d\theta}{\mathrm dx}=\dfrac{\frac{\mathrm dy}{\mathrm d\theta}}{\frac{\mathrm dx}{\mathrm d\theta}}$

We have

$y=b\sin\theta\implies\dfrac{\mathrm dy}{\mathrm d\theta}=b\cos\theta$

$x=a\cos\theta\implies\dfrac{\mathrm dx}{\mathrm d\theta}=-a\sin\theta$

and so

$\dfrac{\mathrm dy}{\mathrm dx}=\dfrac{b\cos\theta}{-a\sin\theta}=-\dfrac ba\cot\theta$

Now compute the second derivative. Notice that $\frac{\mathrm dy}{\mathrm dx}$ is a function of $\theta$ ; so denote it by $f(\theta)$ . Then

$\dfrac{\mathrm d^2y}{\mathrm dx^2}=\dfrac{\mathrm df}{\mathrm dx}$

By the chain rule,

$\dfrac{\mathrm d^2y}{\mathrm dx^2}=\dfrac{\mathrm df}{\mathrm d\theta}\dfrac{\mathrm d\theta}{\mathrm dx}=\dfrac{\frac{\mathrm df}{\mathrm d\theta}}{\frac{\mathrm dx}{\mathrm d\theta}}$

We have

$f=-\dfrac ba\cot\theta\implies\dfrac{\mathrm df}{\mathrm d\theta}=\dfrac ba\csc^2\theta$

and so the second derivative is

$\dfrac{\mathrm d^2y}{\mathrm dx^2}=\dfrac{\frac ba\csc^2\theta}{-a\sin\theta}=-\dfrac b{a^2}\csc^3\theta$

4 0

3 years ago

Is 8.6x10^7 written in scientific notation

yKpoI14uk [10]

Answer:

86000000

Step-by-step explanation:

86000000

Move the decimal point 7 places to the left.

8.6000000*107

Answer:

8.6 x10^7

^So it's 86000000

6 0

3 years ago

What is the volume of the prism?

ozzi

Answer:

Step-by-step explanation:

When you find the volume of prisms, you're essentially taking the area of the base and multiply it by the length, in varied orientations.

In this case, I'd start by finding the area of the parallelogram facing us.

The formula for a parallelogram's area is the same as a rectangle's:

A = b x h

In this case, h = 3 cm and b = 8 cm.

A = 24 cm²

Now, you multiple the area by the length of the parallelogram, which is 8 cm.

V = 24 cm² x 8 cm

= 192 cm³

I hope this helps!

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3 years ago

your closet floor is 90 inches wide and 3 times as long what is the perimeter and area of your closet floor

bearhunter [10]

Answer: 270

Step-by-step explanation:

90x3=270

3 0

3 years ago

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