If you can. i will give brainiest to best answer. this question is a calculus/trigonometry question. i ask that you look over my work, but if you don't have the time, i ask that you me answer the questions i don't know.

7 is incorrect. The answer should be -4. Here's how I'd derive it:

With , we should expect . If , then

Also,

so we should expect and

You seem to be taking

but this is not an identity.

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8 is incorrect. Just a silly mistake, you swapped the order of the terms in the numerator. It should be

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9. Use the identity from (7). lies in the second quadrant, so

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12.

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13.

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14.

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15.

can someone answer this question plz

step-by-step explanation:

the answer is b: 18

step-by-step explanation:

use the pythagorean theorem to .

a^2+b^2=c^2

plug 18 for "r"

the 2 legs are 18 and 24

18^2+24^2=c^2

324+576=c^2

900=c^2

c=30

30-12=18

18 is the radius

: )