What is the range of the function f(x)=e^x / e^x+c ? Assume that c is a constant greater than zero. A. 0< f(x) <1 B. -1< f(x) <0 C. 1 < f(x) <2 D. -1< f(x) <1

Mr and mrs smith buy tickets for themselves and their four children. the cost of an adult ticket is ? 6 more than the adult ticket. the total cost of the six tickets is ? 40.50 work out the cost of an adult ticket. in your working let c be the cost of the child ticket and a be the cost of the adult ticket.