Given the lines m and n are parallel and intersected by a line ,what is the value of x ?

Of four points are collinear, they are also coplanar

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?

Which is f(5) for the function –2x2 + 2x - 3?