plz answer each of them thanks so much

11.1.5 Exercises 1. Suppose f(z, y) = 1- x2 - y' and R is the rectangle with vertices (0,0), (6,0), (6,4). (0,4). In each part, estimate / / f(z, y) dA using Riemann sums. For R underestimates or overestimates, consistently use either the lower left-hand corner or the upper right-hand corner of each rectangle in a subdivision, as appropriate. (a) Without subdividing R. Underestimate = Overestimate = (b) By partitioning R into four equal-sized rectangles. Underestimate - Overestimate - Make Interactive 11.2.3 Exercises 1. Evaluate the iterated integral fo f 3my dady Make Interactive 4. Find [ fi ryesty dyde Make Interactive 5. Calculate the double integral J J. (62 + 8y + 48) dA where R is the region: 0