Find the surface area of a sphere with a diameter 10 cm

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

The figures below are made out of circles, semicircles, quarter circles, and a square. find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations).

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 2