Hey I need alot of help with my math so please help me asap

Kevin is an insurance salesman. when he sells a policy, he makes 20 percent of the policy premium (p) up front; then each year the policy is active, he receives 15 percent of the original premium. which equation could be used to figure his total commission on a policy that has been active for five years? c=0.80p c=0.20p + 0.15p c=0.35p + 4(0.15) c=0.95p

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.