Values of f(x,y) are given in the table below.
Let R be the rectangle 1 ≤ x ≤ 1.6, 2 ≤ y ≤ 3.2. Find a Riemann sum which is a reasonable estimate for ∫R f(x,y) da with Δx = 0.2 and Δy = 0.4.
y/x | f(x,y)
1.1 | 6
1.3 | -1
1.5 | 2
2.2 | 6
2.6 | -1
3.0 | 4