If log a= -5, what is the value of a?

Geometry paper. i don't know how to do the rest. questions 5. 8. 9. and 10.

Answer this question! 30 points and brainliest!

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