Backflow preventers should be tested when installed, and then

3x + 4y = 5 x- 3y = -7 solve by substitution

Tommy buys a sweater that is on sale for 40% off the original price. the expression p -0.4p can be used to find the sale price of the sweater, where p is the original price of the sweater. if the original price of the sweater is 50, what is the sale price?

Which will form a composite function?