The equation t = x 2 - 1936 represents jake's profit at his cell phone store, t represents the total amount of money and x is the number of cell phones. how many cell phones must jake sell to break even (t = 0)?

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? )