If y = 9x − 7, which of the following sets represents possible inputs and outputs of the function, represented as ordered pairs? a) {(0, −7), (1, 2), (−1, −16)} b) {(−7, 0), (2, 1), (−16, −1)} c) {(1, 9), (2, 7), (3, 16)} d) {(7, 9), (8, 10), (9, 11)}

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

The table below shows the approximate height of an object x seconds after the object was dropped. the function h(x)= -16x^2 +100 models the data in the table. for which value of x would this model make it the least sense to use? a. -2.75 b. 0.25 c. 1.75 d. 2.25

Having a hard time understanding this question (see attachment).