The subject of the formulae ,`A=2h(l+b)` is_____

Make l as the subject of the formula A=2(lb+bh+hl). The following steps are involved in solving the above problem Arrange them in sequential order.

Make f as the subject of the formula

Make r the subject of the formula V=(pir^(2)h)/(3) . Find r, when V=27 pi cm^(3) and h=4cm.

Make b the subject for the formula f=(a+b)/(a) .

Make h the subject of the formula, where V=lbh, and find h, when V=960cm^(3),l=20cm , and b=12cm.