Someone help please and make sure it’s right please :)

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?

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x