Can any one show their work and do these problems

15% of 40 60% of 600 what percent 300 is 300

10%of what number is 30

16 more than the product of 5 and p

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?

Cole says the distance between points (-5,0) and (0,-5)is 5 units. is he correct? explain why or why not.