Ineed some with this math problem. i've had it explained to me two different ways. if x= -3 then what would be the answer to x^2 + 5 = ? my teacher says it is 14 but then someone else mentioned that order of operations says that the answer is -4.

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%?