Concept explainers
Reminder Round all answers to decimal places unless otherwise indicated.
Investing in the Stock Market You are considering buying three stocks whose prices at time t are given by
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Functions and Change: A Modeling Approach to College Algebra (MindTap Course List)
- Mortgage Rates The following table is taken from the website of Freddie Mac. It shows rates for 30-year fixed-rate mortgages since 1970. y=Year r=Mortgagerate 1975 9.05 1980 13.74 1985 12.43 1990 10.13 1995 7.93 2000 8.05 2005 5.87 2010 4.69 2015 3.84 a. Explain in practical terms the meaning of r(2003). b. Use the table to estimate the value of r(2003).arrow_forwardPower Consumption: The figure shows the power consumption in San Francisco for a day in September (P is measured in megawatts; t is hours stating at midnight). (a) What was the power consumption at 6:00 A.M? At 6:00 P.m.? (b) When was the power consumption the lowest? (c) Find the net change in the power consumption from 9:00 A.M. to 7:00 P.M/arrow_forwardOzone Depletion According to an article in the New York Times, "Government scientists reported last week that they had detected a slowdown in the rate at which chemicals that deplete the earths protective ozone layer are accumulating in the atmosphere." Letting c(t) be the amount of ozone-depleting chemicals at time t, what does this statement tell you about c(t), c(t) and c(t)? Source: The New York Times.arrow_forward
- Crime Rate Sociologists have found that crime rates are influenced by temperature. In a midwestern town of 100.000 people, the crime rate has been approximated as, C=110(T60)2+100 where C is the number of crimes per month and T is the average monthly temperature in degrees Fahrenheit. The average temperature for May was 76, and by the end of May the temperature was rising at the rate of 8 per month. How fast is the crime rate rising at the end of May?arrow_forwardAn Uncertain Investment Suppose you invested 1300 in the stock market two years ago. During the first year the value of the stock increased by 12%. During the second year, the value of the stock decreased by 12%. How much money is your investment worth at the end of the two-year period? Did you earn money or lose money? Note: The answer to the first question is not 1300arrow_forward
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