Find 13 3 dA over the region R = {(x, y) | 0 x 4, 0 y 3} by identifying it as the volume of a solid Suppose that f(x, y) = 4x + 5y and the region D is given by {(x, y) | 1 x 5, 1 y 5}. D a Then the double integral of f(x, y) over D is f(x, y) dady = D Suppose that f(x, y) D = - and the region D is given by {(x, y) | 3 x 4, 3 y 6}. Then the double integral of f(x, y) over D is f(x, y) ddy Round your answer to four decimal places.