To which family does the function y=2^x + 5 belong

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

Find the value of x for which line a is parallel to line b

I’m really confused and need your assist me with this question i’ve never been taught