Applying the Concepts

  1. 105.

    1. Initial expenses

    2. Breaking even

    3. $640

    4. P=(695/8)n750

  2. 107. 110

  3. 109. He should trim the hedge every 10 days.

  4. 111.

    1. x: time in weeks; y: amount of money after x week in the account; y=7x+130

    2. Slope: weekly deposit in the account; y-intercept: initial deposit

  5. 113.

    1. x: number of months since purchase of the refrigerator; y: amount owed after x months; y=15x+600

    2. Slope: monthly payment; y-intercept: initial charge

  6. 115.

    1. x: number of years after 2010; y: life expectancy of a female born in the United States in the year x+2010; y=0.17x+80.8

    2. Slope: rate of increase in the life expectancy of a female born in the United States; y-intercept: ­current life expectancy of a female born in the United States in 2010

  7. 117. No extra ...

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