Twice the difference of a number and 3 equals 8

Satchi found a used bookstore that sells pre-owned dvds and cds. dvds cost $9 each, and cds cost $7 each. satchi can spend no more than $45.

Astore ordered 750 candles a total wholesale cost of $7910.20. the soy candles cosy $12.17 each and thespecialty candles cost $9.58each. how many of each were bought?

Reinel saves 30% of every pay check. his paycheck last week was 560$. how much did reniel save last week?