Me asap plz

create a problem that show the rational numbers are closed under addition, subtraction, and multiplication (total of 3 problem). show the work to prove that your problem is closed.

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

Roger could feed 5 walruses with 4 kilograms of fish. how many walruses could he feed with 7.2 kilograms of fish?

Using the given information, solve for x. what is the length of ab? what is the length of rs? a) x = 2; ab = 4; rs = 8 b) x = 6; ab = 8; rs = 16 c) x = 4; ab = 6; rs = 12 d) x = 8; ab = 10; rs = 20