Can someone me with sixteen plz it’s due tomorrow

How do i put 3(x+7) in distributive property

The volume, v, of a rectangular prism is determined using the formula, where / is the length, w is the width, and his theheight of the prism. carltren solves for w and writes the equivalent equation w=using this formula, what is the width of a rectangular prism that has a volume of 138.24 cubic inches, a height of 9.6 inches, and a length of 3.2 inches?

Find the least common factor denominator for these two rational 7/x^2 and 7/5x