Find the values of Riemann sums which are reasonable over- and under-estimates for

f(x,y) values

x=2 x=2.2 x=2.4
y=4 6 7 9
y=4.3 5 6 7
y=4.6 4 5 13

Let R be the rectangle 3 < x < 3.2,5 5.4. Find the values of Riemann sums which are reasonable over- and under- estimates for SR f(x,y) dA with Ax = 0.1 and Ay= 0.2.