If f(x) = x+7 and g(x) =1/x-13 what is the domain of (fg) (x)

Astore sells two types of radios. one type sells $87 and the other for $119. if 25 were sold and the sales were $2495, how many of the $87 radios were sold a) 5 b) 20 c) 15 d)10

Icould really use some with this question.

What is the order of these fractions from least to greatest 2/3 7/10 5/8 65/100