Ashton works as a marketing manager for a consumer products firm. his total earnings, a, in x months is given by the function a(x) = 2,400x + 40x2. his total savings, s, in x months is given by the function s(x) = 250x + 500.
write a function that represents ashton's total expenses in months.
how much would ashton's expenses be over 3 years?

The average number of vehicles waiting in line to enter a parking lot can be modeled by the function f left parenthesis x right x squared over 2 left parenthesis 1 minus x right parenthesis endfraction , where x is a number between 0 and 1 known as the traffic intensity. find the rate of change of the number of vehicles waiting with respect to the traffic intensity for the intensities (a) xequals0.3 and (b) xequals0.6.