What are the solutions to this equation?

The multiplication property of zero states that the product of any number and 0 is 0. what must be true about either a or b to make ab=0

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?

Triangle knm is what is true about the sides of knm