Evaluate the integral by making an appropriate change of variables. 5 cos 9 y − x y + x dA R where R is the trapezoidal region with vertices (5, 0), (9, 0), (0, 9), and (0, 5)

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? )