What is the voulme of a cube with the side length of 5

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Find the circumference of a pizza with a diameter of 10 inches round to the nearest tenth

Martha is training for a duathlon, which includes biking and running. she knows that yesterday she covered a total distance of over 55.5 miles in more than than 4.5 hours of training. martha runs at a speed of 6 mph and bikes at a rate of 15.5 mph.