
Concept explainers
The graphing calculator screen displays an exponential function that models the U.S. population age 65 and over, y, in millions, x years after 1899. Use this information to solve Exercises 31-32.
a. Explain why an exponential function was used to model the population data.
b. Use the graphing calculator screen to express the model in function notation, with numbers rounded to three decimal places.
c. According to the model in part (b), how many Americans age 65 and over were there in 2010? Use a calculator with a
key or a
d. According to the model in part (b), how many Americans age 65 and over will there be in 2020? Round to one decimal place. Does this rounded number overestimate or underestimate the 2020 population projection displayed by the bar graph? By how much?

Want to see the full answer?
Check out a sample textbook solution
Chapter 7 Solutions
Thinking Mathematically (7th Edition)
- Solve the problemarrow_forwardPerform long division on the integrand, write the proper fraction as a sum of partial fractions, and then evaluate the integral. 30x³-60x²+8 dx 2 x-2x After performing the long division, write the resulting proper fraction as a sum of partial fractions. Evaluate the integral. 30x³-60x²+8 2 x² -2x dx=arrow_forwardEvaluate the following integral. x/6 S tan 2x dx x/12arrow_forward
- Evaluate the integral using any appropriate algebraic method or trigonometric identity. S- dy 18 √2 (1+y2/3) yarrow_forwardiid B1 Suppose X1, ..., Xn fx(x), where 2 fx(x) = x exp(−x²/0), 0<< (0 otherwise). (a) Find the maximum likelihood estimator of 0. (b) Show that the MLE is an unbiased estimator of 0. (c) Find the MSE of the MLE. Hint: For parts (b) and (c), you may use integration by parts.arrow_forward4. Suppose the demand for a certain item is given by D(p)=-2 p² - 4p+350, where p represents the price of the item in dollars. a) Find the rate of change of demand with respect to price. b) Find and interpret the rate of change of demand when the price is $11.arrow_forward
- √3-x, x≤3, 2. For f(x) = 1 find each of the following. x > 3, x-3' 1. f(-6) 2. f(3) 3. f(7) 3. Find the domain of each of the following functions.arrow_forward1. Using the definition of the derivative, find f'(x). Then find f'(2), f'(0) and f'(3) when the derivative exists. a) f(x)=5x²-6x-1arrow_forward2. f(x)=√7-x 4. A manufacturer has a monthly fixed cost of $40,000 and a production cost of $8 for each unit produced. The product sells for $12 per unit. 1. What is the cost function? 2. What is the revenue function? 3. Compute the profit corresponding to 12,000 units. 5. A rectangular box is to have a square base and a volume of 20 ft3. The material for the base costs $0.30 per ft2, the material for the sides cost $0.10 per ft2, and the material for the top costs $0.20 per ft2. Letting x denote the length of one side of the base,arrow_forward
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw HillBig Ideas Math A Bridge To Success Algebra 1: Stu...AlgebraISBN:9781680331141Author:HOUGHTON MIFFLIN HARCOURTPublisher:Houghton Mifflin Harcourt
- College Algebra (MindTap Course List)AlgebraISBN:9781305652231Author:R. David Gustafson, Jeff HughesPublisher:Cengage LearningAlgebra & Trigonometry with Analytic GeometryAlgebraISBN:9781133382119Author:SwokowskiPublisher:Cengage




