What is the result of adding these two equations 2x+7y=4-2x-8y=-2​

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?

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')

Which of the following is the graph of y= square root -x-3