I have issues with finding area with midpoint

if steps can be provided, I would appreciate that! Thank you!

$(1$ point$)$ Approximate the area under the parabola $\backslash ($ y$=64-$x$^\{2\}\backslash )$ from $0$ to $8$ using five equal subintervals in the following ways.

Using left endpoints:

Area is approximately

Using right endpoints:

Area is approximately

Using midpoints:

Area is approximately