Using estimates of rainfall, evaporation, and water consumption, the town engineer developed the following model of the water volume in the reservoir as a function of time V(t) = 10^9 + 10^8 (1 - e^-t/100) - rt where V is the water volume in liters, t is time in days, and r is the town's consumption rate in liters per day. Write two user-defined functions. The first function should define the function V(t) for use with the f zero function. The second function should use fzero to compute how long it will take for the water volume to decrease to x percent of its initial value of 10^9 L. The inputs to the second function should be x and r. Test your functions for the case where x = 50 percent and r = 10^7 L/day. Using estimates of rainfall, evaporation, and water consumption, the town engineer developed the following model of the water volume in the reservoir as a function of time V(t) = 10^9 + 10^8 (1 - e^-t/100) - rt where V is the water volume in liters, t is time in days, and r is the town's consumption rate in liters per day. Write two user-defined functions. The first function should define the function V(t) for use with the f zero function. The second function should use fzero to compute how long it will take for the water volume to decrease to x percent of its initial value of 10^9 L. The inputs to the second function should be x and r. Test your functions for the case where x = 50 percent and r = 10^7 L/day