Esmeralda likes to listen to music while she works out. she had a playlist on her mp3 player that lasted 40 minutes, but she accidentally deleted 25% of the music. does esmeralda have enough music left on her playlist for a 30 minute workout?

According to statistics a person will devote 32 years to sleeping and watching tv. the number of years sleeping will exceed the number of years watching tv by 18. over a lifetime, how many years will the person spend on each of these activities

On a piece of paper graph f(x)=5•(0.4)^x

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.