Which relation describes a function?

a) {(0, 0), (0, 2), (2, 0), (2, 2)}
b) {(−2, −3), (−3, −2), (2, 3), (3, 2)}
c) {(2, −1), (2, 1), (3, −1), (3, 1)}
d) {(2, 2), (2, 3), (3, 2), (3, 3)}

The function a represents the cost of manufacturing product a, in hundreds of dollars, and the function b represents the cost of manufacturing product b, in hundreds of dollars. a(t) = 5t + 2 b(t) = 7t - 2t +4 find the expression that describes the total cost of manufacturing both products, a(t) + b(t). a. 7t^2 - 7t + 2 b. 7t^2 + 3 +6 c. 7t^2 + 7t - 6 d. 7t^2 - 3t + 6

The base of a rectangular pyramid is 13 inches long and 12 inches wide. the height of the pyramid is 8 inches. what is the volume of the pyramid

What is the scale factor of this dilation? a) 1/2 b) 1/3 c) 2 d) 3