MATLAB.

how would you solve that in matlab? please, I am trying to understand...

Problem 1 (25%) Consider that the concentration of certain substance in a liquid, changes by the monotonically decreasing relation C(t) = Coe-kt [kg/m3], with Co = 5 [kg/m3] the initial concentration, and k = 2 [1/s], a rate constant. Consider a time vector given by t = [0, 0.1,0.2, ..., 10] [s]. Determine: a. The time when the concentration passes below half of the initial one. b. The time when the concentration is the closest to 30% of the initial one. C. The concentration at time t = 7