MYLAB MATH COLLEGE ALGEBRA IN CONTEXT
MYLAB MATH COLLEGE ALGEBRA IN CONTEXT
6th Edition
ISBN: 9780135823002
Author: HARSHBARGER
Publisher: PEARSON
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Unitary Method
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Chapter 3.4, Problem 41E

Energy Use The following table shows the energy use per dollar of GDP, as a percent, for years from 2000 and projected to 2035. (GDP, gross domestic product, is the monetary value of all the finished goods and services produced within a country’s borders in a specific time period, though GDP is usually calculated on an annual basis. It includes all of private and public consumption, government outlays, investments, and exports less imports that occur within a defined territory.) These data are indexed to 1980, which means that energy use for any year is viewed as a percent of the use per dollar of GDP in 1980.

a.    Find a quadratic function that models these data, with x equal to the number of years after 2000 and y equal to the energy use per dollar of GDP, as a percent of the energy use per dollar of GDP in 1980. Report the model with three significant digits.

b.    Graph the model and the data on the same axes.

c.    Use technology to find when this model predicts that energy use per dollar of GDP will reach a minimum.

Energy Use per Dollar of GDP Indexed to 1980

Chapter 3.4, Problem 41E, Energy Use The following table shows the energy use per dollar of GDP, as a percent, for years from

(Source: U.S. Department of Energy)

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Chapter 3 Solutions

MYLAB MATH COLLEGE ALGEBRA IN CONTEXT

Ch. 3.1 - In Exercises 16, (a) determine whether the...Ch. 3.1 - In Exercises 16, (a) determine whether the...Ch. 3.1 - In Exercises 16, (a) determine whether the...Ch. 3.1 - In Exercises 16, (a) determine whether the...Ch. 3.1 - In Exercises 16, (a) determine whether the...Ch. 3.1 - In Exercises 16, (a) determine whether the...Ch. 3.1 - Prob. 7ECh. 3.1 - Prob. 8ECh. 3.1 - Prob. 9ECh. 3.1 - In Exercises 714, (a) graph each quadratic...
Ch. 3.1 - Prob. 11ECh. 3.1 - Prob. 12ECh. 3.1 - In Exercises 714, (a) graph each quadratic...Ch. 3.1 - In Exercises 714, (a) graph each quadratic...Ch. 3.1 - Prob. 15ECh. 3.1 - Write the equation of the quadratic function whose...Ch. 3.1 - The two graphs shown have equations of the forni y...Ch. 3.1 - Prob. 18ECh. 3.1 - Prob. 19ECh. 3.1 - Prob. 20ECh. 3.1 - Prob. 21ECh. 3.1 - Prob. 22ECh. 3.1 - Prob. 23ECh. 3.1 - In Exercises 2130, (a) give the coordinates of the...Ch. 3.1 - Prob. 25ECh. 3.1 - Prob. 26ECh. 3.1 - In Exercises 2130, (a) give the coordinates of the...Ch. 3.1 - In Exercises 2130, (a) give the coordinates of the...Ch. 3.1 - Prob. 29ECh. 3.1 - Prob. 30ECh. 3.1 - Prob. 31ECh. 3.1 - Prob. 32ECh. 3.1 - Prob. 33ECh. 3.1 - Prob. 34ECh. 3.1 - Prob. 35ECh. 3.1 - Prob. 36ECh. 3.1 - Prob. 37ECh. 3.1 - Prob. 38ECh. 3.1 - Prob. 39ECh. 3.1 - Prob. 40ECh. 3.1 - Prob. 41ECh. 3.1 - Prob. 42ECh. 3.1 - Use the graph of each function in Exercises 4146...Ch. 3.1 - Prob. 44ECh. 3.1 - Use the graph of each function in Exercises 4146...Ch. 3.1 - Use the graph of each function in Exercises 4146...Ch. 3.1 - Profit The daily profit for a product is given by...Ch. 3.1 - Profit The daily profit for a product is given by...Ch. 3.1 - Worldwide Mobile Phone Shipments For selected...Ch. 3.1 - Prob. 50ECh. 3.1 - Tourism Spending The equation y = 1.69x2 0.92x +...Ch. 3.1 - Prob. 52ECh. 3.1 - Flight of a Ball If a ball is thrown upward at...Ch. 3.1 - Prob. 54ECh. 3.1 - Crude Oil The U.S. Crude Oil production, in...Ch. 3.1 - Prob. 56ECh. 3.1 - Profit The profit for a certain brand of MP3...Ch. 3.1 - Prob. 58ECh. 3.1 - Prob. 59ECh. 3.1 - Prob. 60ECh. 3.1 - Prob. 61ECh. 3.1 - Prob. 63ECh. 3.1 - Prob. 64ECh. 3.1 - Prob. 65ECh. 3.1 - Prob. 66ECh. 3.1 - Wind and Pollution The amount of particulate...Ch. 3.1 - Drug Sensitivity The sensitivity S to a drug is...Ch. 3.1 - Falling Object A tennis ball is thrown downward...Ch. 3.1 - Break-Even The profit for a product is given by P...Ch. 3.1 - Flight of a Ball A softball is hit with upward...Ch. 3.1 - Flight of a Ball A baseball is hit with upward...Ch. 3.1 - Apartment Rental The owner of an apartment...Ch. 3.1 - Rink Rental The owner of a skating rink rents the...Ch. 3.1 - World Population A low-projection scenario for...Ch. 3.2 - In Exercises 110, use factoring to solve the...Ch. 3.2 - In Exercises 110, use factoring to solve the...Ch. 3.2 - In Exercises 110, use factoring to solve the...Ch. 3.2 - In Exercises 110, use factoring to solve the...Ch. 3.2 - In Exercises 110, use factoring to solve the...Ch. 3.2 - In Exercises 110, use factoring to solve the...Ch. 3.2 - In Exercises 110, use factoring to solve the...Ch. 3.2 - In Exercises 110, use factoring to solve the...Ch. 3.2 - In Exercises 110, use factoring to solve the...Ch. 3.2 - In Exercises 110, use factoring to solve the...Ch. 3.2 - In Exercises 116, find the x-intercepts...Ch. 3.2 - In Exercises 116, find the x-intercepts...Ch. 3.2 - In Exercises 116, find the x-intercepts...Ch. 3.2 - In Exercises 116, find the x-intercepts...Ch. 3.2 - In Exercises 116, find the x-intercepts...Ch. 3.2 - In Exercises 116, find the x-intercepts...Ch. 3.2 - Use a graphing utility to find or to approximate...Ch. 3.2 - Prob. 18ECh. 3.2 - Use a graphing utility to find or to approximate...Ch. 3.2 - Prob. 20ECh. 3.2 - Prob. 21ECh. 3.2 - Prob. 22ECh. 3.2 - Prob. 23ECh. 3.2 - Prob. 24ECh. 3.2 - Prob. 25ECh. 3.2 - Prob. 26ECh. 3.2 - Prob. 27ECh. 3.2 - Prob. 28ECh. 3.2 - In Exercises 2934, use the square root method to...Ch. 3.2 - Prob. 30ECh. 3.2 - Prob. 31ECh. 3.2 - Prob. 32ECh. 3.2 - Prob. 33ECh. 3.2 - Prob. 34ECh. 3.2 - Prob. 35ECh. 3.2 - Prob. 36ECh. 3.2 - Prob. 37ECh. 3.2 - Prob. 38ECh. 3.2 - Prob. 39ECh. 3.2 - Prob. 40ECh. 3.2 - Prob. 41ECh. 3.2 - Prob. 42ECh. 3.2 - Prob. 43ECh. 3.2 - Prob. 44ECh. 3.2 - Prob. 45ECh. 3.2 - Prob. 46ECh. 3.2 - Prob. 47ECh. 3.2 - Prob. 48ECh. 3.2 - Prob. 49ECh. 3.2 - Prob. 50ECh. 3.2 - Prob. 51ECh. 3.2 - In Exercises 4954, find the exact solutions to...Ch. 3.2 - Prob. 53ECh. 3.2 - Prob. 54ECh. 3.2 - Prob. 55ECh. 3.2 - Prob. 56ECh. 3.2 - In Exercises 5558, you are given the graphs of...Ch. 3.2 - Prob. 58ECh. 3.2 - Prob. 59ECh. 3.2 - Prob. 60ECh. 3.2 - Prob. 61ECh. 3.2 - Prob. 62ECh. 3.2 - In Exercises 6374, solve analytically and then...Ch. 3.2 - Prob. 64ECh. 3.2 - Prob. 65ECh. 3.2 - In Exercises 6374, solve analytically and then...Ch. 3.2 - In Exercises 6374, solve analytically and then...Ch. 3.2 - Prob. 68ECh. 3.2 - Prob. 69ECh. 3.2 - Prob. 70ECh. 3.2 - Prob. 71ECh. 3.2 - In Exercises 6374, solve analytically and then...Ch. 3.2 - Prob. 73ECh. 3.2 - In Exercises 6374, solve analytically and then...Ch. 3.2 - Prob. 75ECh. 3.2 - Prob. 76ECh. 3.2 - Prob. 77ECh. 3.2 - Prob. 78ECh. 3.2 - Prob. 79ECh. 3.2 - Prob. 80ECh. 3.2 - Prob. 81ECh. 3.2 - International Travel to the United States The...Ch. 3.2 - Gold Prices The price of an ounce of gold in U.S....Ch. 3.2 - Non-White Population The number of millions of...Ch. 3.2 - Retail Sales November and December retail sales,...Ch. 3.2 - Prob. 86ECh. 3.2 - World Population One projection of the world...Ch. 3.3 - In Exercises 110, sketch the graph of each...Ch. 3.3 - Prob. 2ECh. 3.3 - Prob. 3ECh. 3.3 - Prob. 4ECh. 3.3 - Prob. 5ECh. 3.3 - Prob. 6ECh. 3.3 - Prob. 7ECh. 3.3 - Prob. 8ECh. 3.3 - Prob. 9ECh. 3.3 - Prob. 10ECh. 3.3 - Prob. 11ECh. 3.3 - Prob. 12ECh. 3.3 - a.Graph f(x)={4x3ifx3x2ifx3 b.Find f(2) and f(4)....Ch. 3.3 - Prob. 14ECh. 3.3 - Prob. 15ECh. 3.3 - Prob. 17ECh. 3.3 - Prob. 18ECh. 3.3 - Prob. 19ECh. 3.3 - Prob. 20ECh. 3.3 - Prob. 21ECh. 3.3 - Prob. 22ECh. 3.3 - Prob. 23ECh. 3.3 - Prob. 24ECh. 3.3 - Prob. 25ECh. 3.3 - Prob. 26ECh. 3.3 - Prob. 27ECh. 3.3 - Prob. 28ECh. 3.3 - Prob. 29ECh. 3.3 - Prob. 30ECh. 3.3 - Prob. 31ECh. 3.3 - Prob. 32ECh. 3.3 - Compare the graph in Exercise 30 with the graph in...Ch. 3.3 - Prob. 34ECh. 3.3 - Prob. 35ECh. 3.3 - Prob. 36ECh. 3.3 - Prob. 37ECh. 3.3 - Prob. 38ECh. 3.3 - Prob. 39ECh. 3.3 - Prob. 40ECh. 3.3 - Prob. 41ECh. 3.3 - Prob. 42ECh. 3.3 - Electric Charges For the nonextreme weather...Ch. 3.3 - Prob. 44ECh. 3.3 - First-Class Postage The first-class postage...Ch. 3.3 - Income Tax The U.S. federal income tax owed by a...Ch. 3.3 - Banks The number of banks in the United States for...Ch. 3.3 - Wind Chill The formula that gives the wind chill...Ch. 3.3 - Female Physicians Representation of females in...Ch. 3.3 - Prob. 50ECh. 3.3 - Prob. 51ECh. 3.3 - U.S. Population The U.S. population can be modeled...Ch. 3.3 - Prob. 53ECh. 3.3 - Prob. 54ECh. 3.3 - Prob. 55ECh. 3.3 - Prob. 56ECh. 3.3 - Purchasing Power The purchasing power of a 1983...Ch. 3.3 - Trust in the Government The percent of people who...Ch. 3.3 - Prob. 59ECh. 3.3 - Concentration of Body Substances The concentration...Ch. 3.3 - Investing If money is invested for 3 years with...Ch. 3.3 - Investing If money is invested for 4 years with...Ch. 3.3 - Investing The present value that will give a...Ch. 3.3 - Investing The present value that will give a...Ch. 3.4 - In Exercises 16, write the equation of the...Ch. 3.4 - Prob. 2ECh. 3.4 - Prob. 3ECh. 3.4 - Prob. 4ECh. 3.4 - Prob. 5ECh. 3.4 - Prob. 6ECh. 3.4 - A ball is thrown upward from the top of a...Ch. 3.4 - Prob. 8ECh. 3.4 - Prob. 9ECh. 3.4 - Prob. 10ECh. 3.4 - Prob. 11ECh. 3.4 - Prob. 12ECh. 3.4 - Prob. 13ECh. 3.4 - Prob. 14ECh. 3.4 - Find the quadratic function that is the best fit...Ch. 3.4 - Prob. 16ECh. 3.4 - Prob. 17ECh. 3.4 - Prob. 18ECh. 3.4 - Prob. 19ECh. 3.4 - Prob. 20ECh. 3.4 - Prob. 21ECh. 3.4 - Prob. 22ECh. 3.4 - Prob. 23ECh. 3.4 - Prob. 24ECh. 3.4 - Smart Phones Bill payment using smart phones is...Ch. 3.4 - Obesity Obesity (BMI 30) increases the risk of...Ch. 3.4 - Wind Chill The table gives the wind chill...Ch. 3.4 - Prob. 28ECh. 3.4 - Prob. 29ECh. 3.4 - Prob. 30ECh. 3.4 - Alzheimers Disease Partially because of American...Ch. 3.4 - Prob. 32ECh. 3.4 - Prob. 33ECh. 3.4 - World Population One projection of the world...Ch. 3.4 - Prob. 35ECh. 3.4 - Prob. 36ECh. 3.4 - Prob. 37ECh. 3.4 - Prob. 38ECh. 3.4 - Prob. 39ECh. 3.4 - Prob. 40ECh. 3.4 - Energy Use The following table shows the energy...Ch. 3.4 - Average Annual Wage The following table shows the...Ch. 3.4 - Insurance Rates The following table gives the...Ch. 3.4 - Banks The table gives the number of banks in the...Ch. 3.4 - U.S. Gross Domestic Product The table gives the...Ch. 3.4 - Auto Noise The noise level of a Volvo S60...Ch. 3.4 - Crude Oil The following table gives the U.S. crude...Ch. 3.4 - Box-Office Revenues The data in the table in the...Ch. 3 - In Exercises 16, use the rules of exponents to...Ch. 3 - In Exercises 16, use the rules of exponents to...Ch. 3 - In Exercises 16, use the rules of exponents to...Ch. 3 - In Exercises 16, use the rules of exponents to...Ch. 3 - In Exercises 16, use the rules of exponents to...Ch. 3 - In Exercises 16, use the rules of exponents to...Ch. 3 - Prob. 7TECh. 3 - Prob. 8TECh. 3 - Prob. 9TECh. 3 - Prob. 10TECh. 3 - Prob. 11TECh. 3 - Prob. 12TECh. 3 - Prob. 13TECh. 3 - Prob. 14TECh. 3 - Prob. 15TECh. 3 - Prob. 16TECh. 3 - Prob. 17TECh. 3 - Prob. 18TECh. 3 - Prob. 19TECh. 3 - Prob. 20TECh. 3 - Prob. 21TECh. 3 - Prob. 22TECh. 3 - Prob. 23TECh. 3 - Prob. 24TECh. 3 - Prob. 25TECh. 3 - Prob. 26TECh. 3 - Prob. 27TECh. 3 - Prob. 28TECh. 3 - Prob. 29TECh. 3 - Prob. 30TECh. 3 - In Exercises 2342, factor each of the polynomials...Ch. 3 - Prob. 32TECh. 3 - Prob. 33TECh. 3 - Prob. 34TECh. 3 - Prob. 35TECh. 3 - Prob. 36TECh. 3 - Prob. 37TECh. 3 - Prob. 38TECh. 3 - Prob. 39TECh. 3 - Prob. 40TECh. 3 - Prob. 41TECh. 3 - Prob. 42TECh. 3 - Prob. 43TECh. 3 - Prob. 44TECh. 3 - Prob. 45TECh. 3 - Prob. 46TECh. 3 - Prob. 47TECh. 3 - Prob. 1RECh. 3 - Prob. 2RECh. 3 - Prob. 3RECh. 3 - Prob. 4RECh. 3 - Prob. 5RECh. 3 - Prob. 6RECh. 3 - Prob. 7RECh. 3 - Prob. 8RECh. 3 - Prob. 9RECh. 3 - Prob. 10RECh. 3 - Prob. 11RECh. 3 - Prob. 12RECh. 3 - Prob. 13RECh. 3 - Prob. 14RECh. 3 - Prob. 15RECh. 3 - Prob. 16RECh. 3 - Prob. 17RECh. 3 - Prob. 18RECh. 3 - Prob. 19RECh. 3 - Prob. 20RECh. 3 - Prob. 21RECh. 3 - Prob. 22RECh. 3 - Prob. 23RECh. 3 - Prob. 24RECh. 3 - Prob. 25RECh. 3 - Prob. 26RECh. 3 - Prob. 27RECh. 3 - Prob. 28RECh. 3 - Prob. 29RECh. 3 - Prob. 30RECh. 3 - Determine whether the function y=3x2 is increasing...Ch. 3 - Prob. 32RECh. 3 - Prob. 33RECh. 3 - Prob. 34RECh. 3 - Find the equation of a quadratic function whose...Ch. 3 - Find the equation of a quadratic function whose...Ch. 3 - Prob. 37RECh. 3 - Prob. 38RECh. 3 - Suppose that q varies directly as the 3/2 power of...Ch. 3 - Prob. 40RECh. 3 - Prob. 41RECh. 3 - Prob. 42RECh. 3 - Prob. 43RECh. 3 - Height of a Ball If a ball is thrown into the air...Ch. 3 - Visas The number of skilled workers visas issued...Ch. 3 - Prob. 46RECh. 3 - Prob. 47RECh. 3 - Prob. 48RECh. 3 - Millionaire's Tax Rate The effective tax rate for...Ch. 3 - Prob. 50RECh. 3 - ATV Deaths The number of ATV-related deaths for...Ch. 3 - Home Range The home range of an animal is the...Ch. 3 - Internet Usage Around 40% of the worlds population...Ch. 3 - Personal Income The income received by people from...Ch. 3 - Prob. 55RECh. 3 - Prob. 56RECh. 3 - National Health Expenditures Health spending is...Ch. 3 - Prob. 58RECh. 3 - Prob. 59RECh. 3 - Prob. 60RE
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