Find the surface area of the pyramid. The side lengths of the base are equal.

What is the value of 1/3x + 7x when x = 5

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

The perimeter of a triangle is 69 cm. the first is 5 cm shorter than the second side. the third side is twice as long the first side. find the length of each side