Can someone help me figure this type of problem out?

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

Sum of the interior angles of a pentagon

Which is an x-intercept of the graphed function? (0, 4) (–1, 0) (4, 0) (0, –1)