SOMEONE, PLEASE HELP ME FIGURE THIS OUT IM BEGGING YOU

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?

Interest begins accruing the date of the transaction except for auto loans mortgages credit card cash advances credit card purchases

Asquare and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square