a) Estimate the area under the graph of

Question

f(x) = 10(sqrt(x))

from x = 0 to x = 4 using four approximating rectangles and right endpoints

Answer 1

just figure f(1)...f(4)

since the rectangles have width 1, your approximation is just the sum of the four values of f.

The value will be a little high, since f is concave downward, so using the right ends of the intervals means the rectangles are a bit too tall.