2. A vase with flowers is filled with 10 cups of water. The flowers in this vase drink the water at a constant rate of 0.03 cups per hour. Write a formula to determine the number of cups of water, c, in the vase in terms of the number of hours, t, that have elapsed since the vase was filled. 3. A racecar travels around an oval track. Let d represent the distance driven by the racecar (in meters) from the starting line, and let t represent the number of seconds since the racecar left the starting line. The function f defined by the formula f(x) = 0.6t + 2t determines the distance the racecar has driven in meters when the racecar has been traveling for t seconds. What is the meaning of f(5)-f(3)?