Need help with math problem if do get 5 star

1. - 15 1/2 feet

2. 62 3/4 feet

3. 0 feet

Step-by-step explanation:

1. Descend means negative, so the answer needs to have a negative sign.

2. Above sea level means positive, so the answer needs to have a positive sign.

3. There is no change in position, so the answer needs to be 0.

hope this helps and is right!! p.s. i really need brainliest :)

f(2x−x2)=−3x2+6x−1

step-by-step explanation:

set up the composite function and evaluate.

f(2x−x2)=−3x2+6x−1

i believe the answers 600m