Question 1 of 10 For what value of x is the rational expression below equal to zero?
20+2x
5-x
A. 10
B. -5
C. 5
D. -10

1. a music store marks up the instruments it sells by 30%. a. if the store bought a guitar for $45, what will be its store price? b. if the price tag on a trumpet says $104, how much did the store pay for it? c. if the store paid $75 for a clarinet and sold it for $100, did the store mark up the price by 30%?