The table below gives values of f(x, y), the number of milligrams of mosquito larvae per square meter in a swamp.. x=0x=2x=4. y=0136. y=3259. y=64814. if x and y are in meters and r is the rectangle 0≤x≤4, 0≤y≤6, estimate ∫rf(x, y)da.. ∫rf(x, y)da≈ . (include units in your answer.) . hint: evaluate the riemann sums using the lower left corners and upper right corners. then take the average of the two riemann sums..