Acompany has tow electric motors consume varying amounts of power. the power consumed by each motor is a function of the time (t in minutes) for which it runs. the cost of power (in $) to run one motor is given by the function ca(t)=t^2-2t+5. the cost of running the second motor is given by cb(t)=3t+2. which gives the total cost of running both motors?

c(t)=3t^3-6t^2+15t
c(t)=2t^2-4t+10
c(t)=t^2+t+7
c(t)=3t^3+6t^2-15t