A truck driver operates a delivery service in a southern city. His start-up costs amounted to $2600. He estimates that it costs him (in terms of gasoline, wear and tear on his truck, etc.) $5.00 per delivery. He charges $7.50 per delivery. Let x represent the number of deliveries he makes. (a) Express the cost C as a function of x. (b) Express the revenue R as a function of x. (c) Determine analytically the value of x for which revenue equals cost. (d) Graph y = C(x) and y2 = R(x) on the same xy-axes and interpret the graphs. (a) C(x)= (Use integers or decimals for any numbers in the expression.)