The distributive property. You need to district it's 7 to x and -1.
I think its true , due to all whole numbers when turned into a fraction are put over one . for example 4 , can be turned into the fraction 4/1 . rational is a number that can be turned into a fraction .
I agree when you plug in the formula A=hb/2=14•12.2/2 = 85.4