X² +2x - 3 factor this

The number of revolutions of two pulleys is inversely proportional to their diameters. if a 24-inch diameter pulley making 400 revolutions per minute is belted to an 8-inch diameter pulley, find the number of revolutions per minute of the smaller pulley.

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

What is the radius of the cone in the diagram? round your answer to the nearest whole number