Question

Complete the table using the function f(x), over the specified interval [a,b], to approximate the area of the region bounded by the graph of y=f(x), the x-axis, and the vertical lines x=a and x=b using the indicated number of rectangles.
Table:
n | 4 | 8 | 20 | 50 | 100 |
approximate area| ? | ? | ? | ? | ? |
function:
f(x) = 9-x^2
interval:
[0,2]