You want to determine how long it takes a car to accelerate from 10 m/s 1 point [W] to 12.9 m/s [W] if it experiences an average acceleration of 2.1 m/s2 [W]. Which expression would you solve to find this measure of time? a. (12.9 + 10) - 2.1 b. (12.9 - 10) X 2.1 C. (12.9 - 10) - 2.1 d. (12.9 x 10) - 2.1 O a. Ob Od