The function f(x) varies directly with x, and f(x)=45 when x=9 evaluate f(x) when x=3 a) 5 b) 9 c)15 d)27

Ataxi company charges $3 for pick-up plus $0.65 for each mile. select the expressions that represent the cost in dollars for a taxi pick-up and m miles. mark all that apply.