Approximate the double integral of (x, y) over the region R partitioned by the given vertical lines

Approximate the double integral of ƒ(x, y) over the region R partitioned by the given vertical lines x = a and horizontal lines y = c. In each sub-rectangle, use (x_k, y_k) as indicated for your approximation.

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fay4 - R n f(x, y) dA Σ f(xk, 3) ΔΑΚ k=1