Algebra

Amtrak's annual passenger revenue for the years
1985-1995 is modeled approximately by the formula

R=-60|x-11|+962

where R is the annual revenue in millions of dollars and
x is the number of years after 1980. In what year was the passenger revenue $722 million?

  1. 👍
  2. 👎
  3. 👁
  1. solve:
    -60|x-11|+962 = 722
    -60|x-11| = -240
    |x-11| = 4
    x-11 = 4 or -x+11 = 4
    x =15 or x = 7

    so either in 1995 or 1987

    check:
    http://www.wolframalpha.com/input/?i=-60%7Cx-11%7C%2B962+%3D+722

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Math

    During exercise, the recommended maximum heart rate in beats per minute is modeled by the formula M=176-0.8A, where M is the maximum heart rate and A is the person’s age. Approximately, at what age would you have a recommended

  2. math

    The owner of a luxury motor yacht that sails among the 4000 Greek islands charges $960/person/day if exactly 20 people sign up for the cruise. However, if more than 20 people sign up (up to the maximum capacity of 100) for the

  3. Math Pre-Cal (Exponential Functions)

    A house was valued at $110,000 in the year 1985. The value appreciated to $145,000 by the year 2005. -What was the annual growth rate between 1985 and 2005? Assume that the house value continues to grow by the same percentage.

  4. 7 th Math

    During exercise, the recommended maximum heart rate in beats per minute is modeled by the formula, M = 176 – 0.8A, where M is the maximum heart rate and A is the person’s age. Solve the formula for A. At what age would you

  1. Math

    During exercise, the recommended maximum heart rate in beats per minute is modeled by the formula M=176-0.8A, where M is the maximum heart rate and A is the person’s age. Approximately, at what age would you have a recommended

  2. Pre Calculus

    17. population growing at an annual rate r will triple in a time t given by the formula t = ln 3/r If the growth rate remains constant and equals 9% per year, how long will it take the population of the town to triple? a. 6 . 6

  3. calculus

    I solved this problem, can someone check it to make sure I did it right. There are two parts to this intrepation and estimate of the value. Let C(t) be the total value of the US currency (coins and banknotes) in circulation at

  4. precalculus

    Using data from past years, the economists for smith brothers inc determined that the revenue f the company can be modeled by the function R(x)=0.0125x^2+412x. In addition, the function C(x)=12225+0.00135x^2 models the total cost

  1. Math

    Suppose a deposit of $3,500 in a savings account that paid an annual interest rate r (compounded yearly) is worth $3,910 after 2 years. Using the formula A=P(1+r)^t, we have 3,910=3,500(1+r) ^2Solve for r to find the annual

  2. math ( algebra 2 )

    a newspaper company currently charges $11 a week to its subscribers, but is considering raising their price. the company found that the weekly revenue y can be modeled by the function y= -750(x-40)(x+20) where x is the number $.50

  3. Math check my answer

    During exercise, the recommended maximum heart rate in beats per minute is modeled by the formula M = 176 – 0.8A, where M is the maximum heart rate and A is the person’s age. Approximately, at what age would you have a

  4. Math

    Based on census data, the population of Freedonia is modeled by the function P(t)= 310t^2+25474 people, where t represents the number of years after 1990. Use this function to determine how fast the population was increasing at

You can view more similar questions or ask a new question.