PLS PLS PLS OH MIGHTY PLS HELP, BRAINLIEST WILL BE GIVEN GIVEN YES​

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?

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?

How can (square root of 25) ^2 be rewritten?