Please help I will mark brainlist if correct

Mathematics

1 answer:

astra-53 [7]3 years ago

7 0

First you find the area of both circles... The smaller one is Pi, and the other one is 1.75pi. Take 1.75pi and multiply it by 13, getting 22.75pi. Do the same for the other circle, getting 13pi. Now subtract the former number by the latter number, getting 9.75pi, and that is the volume.

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Marrrta [24]

3/2

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3 years ago

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Simplify as far as possible.<br>1<br>3cos (180° + x)sin (360° - X)<br>sin (360° + x)cos (180° - x)

KengaRu [80]

Answer:

See below

Step-by-step explanation:

cos (180 + x) = - cos x

sin (360 + x) = sin x

sin 360 - x) = -sin x

cos (180 - x) = - cos x

3cos (180° + x)sin (360° - X) = -3cos x (- sin x) = 3 cosx sinx

sin (360° + x)cos (180° - x) = sin x (- cos x) = -sinx cosx

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I am not sure what the question really is, but hopefully the above can steer you in the right direction.

6 0

2 years ago

a student either knows the answer or guesses. Let 3434 be the probability that he knows the answer and 1414 be the probability t

Arlecino [84]

Answer: $\dfrac{12}{13}$

Step-by-step explanation:

Let A = he known the answer then A' = he guess the answer.

B = he answered it correctly

As per given , we have

$P(A)=\dfrac{3}{4}\ \ ,\ \ P(A')=\dfrac{1}{4}$

$P(B|A)=1$

$P(B|A')=\dfrac{1}{4}$

By Bayes theorem , we have

$P(A|B)=\dfrac{P(B|A)P(A)}{P(B|A)P(A)+P(B|A')P(A')}\\\\ P(A|B)=\dfrac{1\times\dfrac{3}{4}}{1\times\dfrac{3}{4}+\dfrac{1}{4}\times\dfrac{1}{4}}\\\\= \dfrac{12}{13}$