The sales tax on a digital camera is $7.15. what is the sales tax rate?

One side of a rectangle is 7 feet shorter than seven times the other side. find the length of the shorter side if we also know that the perimeter of the rectangle is 306 feet.

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 2