posted by Rick .
4. a. Estimate the area under the graph of f(x)=sqrt(x^2+4) from x=0 to x=2 using four rectangles and right endpoints.
I see rectangles at .5, 1.0, 1.5, 2 as the right end points
area=[f(.5)+f(1)+f(1.5)+f(2)] *( .5)