What is the answer . i really need it.

Solve the system of equations. y= 2x y= x^2 - 15

Polynomial that can be factored as (3x-4)(3x+4)

A3-dimensional figure has a square base and 4 lateral faces that meet at a point. explain the difference between the cross sections when a slice is made perpendicular to the base through the vertex, and when a slice is made perpendicular to the base and not through the vertex