Are the graphs of each pair of equations parallel, perpendicular, or neither? -2x + 5y = -4 and y = (-5/2)x + 6

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 is the anwers for 9+2x=5x-3-x

One hectometer is a) 1/1000 of a meter. b) 1/100 of a meter. c) 10 meters. d) 100 meters. e) 1000 meters.