Answer Happy

7.3
Round to two decimal places.
Approximate the area under the graph of f(x) and above the x-axis with rectangles, using the following methods with n=4. f(x)=x2​+4, from x=1 to x=9 (a) Use left endpoints. (b) Use right endpoints. (c) Average the answers in parts (a) and (b) (d) Use midpoints.