Find the polynomial im descending power of x representing the area of the shaded region

Aiden drives to school and back each day. the school is 16 miles from his home. he averages 40 miles per hour on his way to school. if his trip takes 1 hour, at approximately what speed does aiden drive home?

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)