Which pair of expressions below are are equivalent a. 7(2x)and 9xb. 3x+5x and 15xc. 4(2x-6) and 8x - 24d. x+x+x+x and x4thpower

Graph the line that represents a proportional relationship between d and t with the property that an increase of 33 units in t corresponds to an increase of 44 units in d. what is the unit rate of change of dd with respect to t? (that is, a change of 11 unit in t will correspond to a change of how many units in d? )