(1 point) Write a formula representing the function. The average velocity, u, for a trip over a fixed distance, d, is inversely proportional to the time of travel, t. ULet f(x) be the temperature ('C) when the column of mercury in a particular thermometer is x inches long. What is the meaning of f (12) in practical terms? The temperature when the column of mercury is 12 inches long The length of the column of mercury when the temperature is 12 degrees Celsius Problem 4.(1 point) A town has a population of 1200 people at time t = 0. In each of the following cases, write a formula for the population, P, of the town as a function of year t. a) The population increases by 69 people per year. P(t) = b) The population increases by 4.5% per year. P(t) = Note: You can earn partial credit on this