How to do double sided equations

A bookstore charges a standard rate for paperback or hardback books. The cost of a paperback book is 11 dollars less than the cost of a hardback book. Recently one day of sales totaled $784.10.

Diver jumps from a distance that is 48 feet above the surface and stops descending 12 feet below the surface what was the length of her jump?

A lifeguard is 12.5 ft above a pool in her lifeguard station when she spots a swimmer struggling 42.3 ft away from the base of her station.

6 - 2 1/4 equals 1/2

What are the terms in the expression 350n-30n+350 - (50+10n)

A grab bag contains 9 nasty teeth and 6 spinners. Bill is the first to select from the grab bag and then Jane selects from the remaining gifts in the grab bag.

Give an example of multiplying a negative and a negative

Definitons: 1) Expand (multiply over brackets) 2) collecting like terms 3) rearranging 4) solving equations

In the expression, 5.28 x 10^3, which number is the base?

Zita wants to buy an mp3 player that is on sale for 25% off. the orignal price of the mp3 player was $200. what is the amount of the discount