If the radius is 4 what is the volume of a sphere

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

An equation in slope-intersept form the lines that passes thought (-8,1) and is perpindicular to the y=2x-17.

What is the solution for the following system of equations? use any method to solve. y = -x +4 y = x - 2 a. ( 4 , -2) b. (2, 1) c. (3, 1) d.(3, -2)