X/7 = 0 i assume this would be 0/7 = 0 but i'm not sure.

What is the approximate circumference of the circle shown below?

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

What is the greatest number of parts of a circle that can be formed by cutting the circle with 7 straight cuts? (note: the parts do not have to be equal in size)