In Exercises 1 3 identify the initial amount a and the rate of growth as a percent of the exponential function Evaluate the function when t 5 Round your answer to the nearest tenth 1 f t 220 1 015 237 2 p t 5 5 1 5 31 8 3 h t 2 5 In Exercises 4 and 5 write a function that represents the situation 4 A college s tuition of 135 per credit hour increases by 5 each year 5 A bee population of 3000 increases by 40 every year In Exercises 6 8 identify the initial amount a and the rate of decay r as a percent of the exponential function Evaluate the function when t 3 Round your answer to the nearest tenth 6 f t 1420 0 895 4 x 2 6 8 10 15 20 y 5 7 y In Exercises 9 and 10 write a function that represents the situation 9 A 25 000 car decreases in value by 16 7 each year 10 A company s annual revenue of 487 000 decreases by 4 2 each year In Exercises 11 and 12 determine whether the table represents an exponential growth function an exponential decay function or neither Explain 12 11 X 9 2 y 8 y 9 2 5 1 9 13 81 54 36 24 In Exercises 13 15 rewrite the function to determine whether it represents exponential growth or exponential decay 13 y 0 3 14 y 3 1 6 15 y 9 0 68 3 16 A car has a value of 20 000 The value of the car is expected to decrease 10 annually for the next 8 years a Write a function that represents the value of the car in dollars y after t years b Use the function to estimate the value of the car after 4 years c Use the graph of the function to estimate the value of the car after 8 years