# Lesson 5 Practice Problems

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1 Name: Date: Lesson 5 Section 5.1: Linear Functions vs. Exponential Functions 1. Complete the table below. Function Linear or Exponential? Linear: Increasing or Decreasing? Exponential: Growth or Decay? Linear: find the slope Exponential: find the base Identify the Vertical Intercept as an Ordered Pair.! = 2! + 4 Linear Increasing Slope = 2 (0,4)!(!) = 3 2!!(!) = 1.5! 2!(!) = !!(!) = 1.8! + 32!(!) = ! Page 189

2 2. For the following three linear functions, identify the vertical intercept, calculate the slope and then write the equation for the function in f(x) = mx + b form. a) x f(x) b) f(x) = {(-2,2), (0,3), (2,4)} c) f(x) 3. For the following three exponential functions, identify the initial value (a), calculate the base (b), and then write the equation for the function in f(x) = ab x form. a) x f(x) b) f(x) = {(0, 2), (1, 4.2), (2, 8.82)} c) f(x) Page 190

3 4. Determine if each data set is linear or exponential, and write the formula for each. Show complete work. a) x f(x) b) x f(x) c) x f(x) d) x f(x) e) x f(x) Page 191

4 Section 5.2: Characteristics of Exponential Functions 5. Complete the table below for each exponential function. Initial Value (a) f(x) = 3.4(1.13) x g(x) = 42(0.62) x h(x) = 1000(1.03) x Base (b) Domain Range Horizontal Intercept Vertical Intercept Horizontal Asymptote Increasing or Decreasing Growth or Decay Page 192

5 Section 5.3: Solving Exponential Equations 6. Given!(!) = !, determine each of the following and show complete work. a) f(5) = b) f(50) = c) Find x when f(x) = 75 d) Find x when f(x) = Given!! = !, determine each of the following and show complete work. a) f(3) = b) f(30)= c) Find x when f(x) = 25 d) Find x when f(x) = Given!! = 25 3!, determine each of the following and show complete work. a) f(1) = b) f(3)= c) Find x when f(x) = 100 d) Find x when f(x) = 5000 Page 193

6 Section 5.4: Applications of Exponential Funcitons 9. The rabbit population in several counties is shown in the following table. Assume this growth is exponential. Let t = 0 represent the year Let a represent the initial population in Let b represent the ratio in population between the years 2006 and Rabbit Population Year Coconino Yavapai Harestew a) Write the equation of the exponential mathematical model for each situation. Round any decimals to two places. Be sure your final result uses proper function notation. Use C(t) for Coconino, Y(t) for Yavapai and H(t) for Harestew. b) Use the models from part a) to forecast the rabbit population in 2012 for each county. Round to the nearest rabbit. Use proper function notation to represent each result. Page 194

7 c) Use the models from part a) to find the following. Show complete work. i. The Rabbit Population in Coconino County reaches 60,000. ii. The Rabbit Population in Yavapai Country reaches 340,000. iii. The Rabbit Population in Harestew falls below d) Which of the scenarios from part c) happened first? Explain your reasoning. Page 195

8 10. Assume you can invest \$1000 at 5% Simple Interest or 4% Compound Interest (Annual). The equation for Simple Interest is modeled by: A = P + Prt. Compound Interest is modeled by A = P(1+r) t. The corresponding equations for these two types of interest are given below. S(t) = t C(t) = 1000(1.04) t a) Complete the table for each function. t S(t) C(t) b) What is the vertical intercept for each function and what does it represent in the context of this problem? c) Graph these two functions on the same graph. Plot and label their intersection. Use window Xmin=0, Xmax = 20, Ymin=1000, Ymax=2500. d) When would the two investments return the same amount? How much would they return? e) Which investment would you go with in the short term (less than 10 years)? Explain. Page 196

9 11. In 2010, the estimated population of Maricopa County was 3,817,117. By 2011, the population had grown to 3,880,244. a) Assuming that the growth is linear, construct a linear equation that expresses the population, P, of Maricopa County t years since b) Assuming that the growth is exponential, construct an exponential equation that expresses the population, P, of Maricopa County t years since c) Use the equation found in part a) to predict the population of Maricopa County in d) Use the equation found in part b) to predict the population of Maricopa County in Page 197

10 12. In each situation below, you will need to graph to find the solution to the equation using the INTERSECTION method described in this lesson. Fill in the missing information for each situation. Include a rough but accurate sketch of the graphs and intersection point. Mark and label the intersection. Round answers to two decimal places. a) Solve 25(1.25) x = 400 Solution: x = Xmin: Xmax: Ymin: Ymax: b) Solve 300(0.85) x = 80 Solution: x = Xmin: Xmax: Ymin: Ymax: c) Solve 300(0.85) x = 1700 Solution: x = Xmin: Xmax: Ymin: Ymax: Page 198

11 d) Solve 17.5(2.05) x = 1 Solution: x = Xmin: Xmax: Ymin: Ymax: e) Solve 2(1.01) x = 12 Solution: x = Xmin: Xmax: Ymin: Ymax: f) Solve 532(0.991) x = 100 Solution: x = Xmin: Xmax: Ymin: Ymax: Page 199

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