Find the nth of sequence is 3n^2-1

Asphere has a diameter of 10 in. what is the volume of the sphere?

To solve the system of equations below, pedro isolated the variable y in the first equation and then substituted it into the second equation. what was the resulting equation? { 5y=10x {x^2+y^2=36

Describe the symmetry of the figure. identify lines of symmetry, if any. find the angle and the order of any rotational symmetry.