Asports club plans to have its lawn mowed. the cost of mowing x square feet of lawn is given by the function f(x) = 0.04x + 3.5, where f(x) represents the cost in dollars. the total area that needs to be mowed is given by the function g(x) = 12x.

which function best describes c(x), the total cost of mowing the lawn of the sports club?

a) c(x) = 0.48x + 3.5x
b) c(x) = 0.48x2 + 3.5
c) c(x) = 0.48x2 + 42x
d) c(x) = 0.48x2 + 42