In which set of ordered pairs, (x, y), is y not a function of x?
a) {(7, 7), (4, 4), (3, 3)}
b) {(7, 4), (4, 7), (4, 3)}
c) {(4, 3), (7, 3)}
d) {(4, 3), (3, 4)}

Which problem would you use the following proportion to solve for? 24/x=40/100 a. what is 40% of 24? b. what percent is 24 of 40? c. twenty-four is 40% of what number? d. forty percent of 24 is what number?