Prices at a laundry mat are a $1.25 per load of wash and $0.75 per 20 minutes of drying time and average low takes 1 hour to dry write a function rule to describe the total cost of washing and drying as a function of the number of loads what is the initial cost and rates of change?

The function a represents the cost of manufacturing product a, in hundreds of dollars, and the function b represents the cost of manufacturing product b, in hundreds of dollars. a(t) = 5t + 2 b(t) = 7t - 2t +4 find the expression that describes the total cost of manufacturing both products, a(t) + b(t). a. 7t^2 - 7t + 2 b. 7t^2 + 3 +6 c. 7t^2 + 7t - 6 d. 7t^2 - 3t + 6