A used book store sells paperback books for $4 each and hardback books for $6 each day. today they sold 40 books and made $180. a. write a system equation to solve the problem

b. how many of each type of book was sold

Aswimming pool has an input pump for filling the pool and an output pump for emptying the pool. the input pump can fill the pool in 3 hours, and the output pump can drain the pool in 5 hours. as you go to bed, the pool is full, but a neighbor’s kid turns on the output pump. at midnight, you awake to find the pool half empty. immediately, you turn on the input pump, but you are sleepy and forget to turn off the output pump. at what time will the pool become full?

At a sale this week, a desk is being sold for $213. this is a 29% discount from the original price. what is the original price?

How do i put 3(x+7) in distributive property