(a) Align the input data to the number of years after 17. Find the exponential model for the female MySpace user data in percentage of all MySpace users by filling in the blanks. (Round all numerical values to three decimal places.) The function x) is the percent of female MySpace users who are years old, data from (b) According to the unrounded model reported in part (a), what is the percentage change in the percentage in your model? (0) What percentage of female Hyipace users are 22 years oldn (Round your answer to one decimal place,) What percentage of female Myfpace vsers are 32 years old? (Round your answer to one decimal place.) Are these anwers fnd uning extrapolation or interpolation? Oextrapolation O nterpolation

Throughout much of the 20th century, the yearly consumption of electricity in the US increased exponentially at a continuous rate of 7% per year. Assume this trend continues and that the electrical energy consumed in 1900 was 1.5 million megawatt-hours. (a) Write an expression for yearly electricity consumption, E, as a function of time, t, in years since 1900. million megawatt-hours (b) Find the average yearly electrical consumption throughout the 20th century. NOTE: Round your answer to the nearest integer. E(t) = million megawatt-hours (c) During what year was electrical consumption closest to the average for the century? NOTE: Round your answer to the nearest integer. During Average Yearly Consumption =

The amount of money in an investment is modeled by the function A(t) = 650(0.7969)'. The variable A represents the investment balance in dollars, and t the number of years since 2001. (A) In 2001, the balance was $ (B) The amount of money in the investment is increasing exponentially (C) The annual rate of change in the balance is r = or r = %. (D) In the year 2009 the investment balance will equal Round answer to the nearest penny. %24

A survey approximates the number of Americans that are age 65 and older and projects that by the year 2050, approximately 82.6 million Americans will be at least 65. The bar graph shows the estimated number of Americans with projected figures for the year 2020 and beyond. A 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 (a)-(d) below. Click the icon to view the bar graph. 最重 ExpReg y = a-b^x a = 3.363809536 b = 1.023357735 a. Explain why an exponential function was used to model the population data. A. An exponential function was used because the data in the bar graph is increasing more and more rapidly. OB. An exponential function was used because population is always modeled using exponential functions. OC. An exponential function was used because there are too many data points to use a linear function. OD. An exponential function was used because…

Which of the following functions classify as exponential? (Select all that apply) O f(z) = 4" O y =-4" O f(r) = +4 O y = - (5") o f(2) 3 (주)" O y = VE O y = 7713 DELL 近