Math/116

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1. Suppose you are at the gas station filling your tank with gas. The function C(g) represents the cost C of filling up the gas tank with g gallons. Given the equation: C(g) = 3.5 (g)

a) Find C(2) 3.5 x 2 = 7

b) Find C(5) 7/5 = 1.4
would this be correct ?

  • Math/116 -

    a is correct b is 3.5(5)=17.5

  • Math/116 -

    Thank you can you explain to me how you got the 17.5 answer please

  • Math/116 -

    3.5 multiplied by 5.

  • Math/116 -

    2. Suppose that the linear equation y = 0.3x + 0.9 represents an estimate of the average cost of gas for year x starting in 2002. The year 2002 would be represented by x = 1, for example, as it is the first year in the study. Similarly, 2008 would be year 7, or x = 7.
    a) What year would be represented by x = 2? (2 pts.)2002
    b) How much did it cost per gallon of gasoline in the year represented by x=2? 2000 divided by 2 = .99

    c) What x-value represents the year 2011? this one I am not sure
    d) Assuming this growth trend continues, what will the price of gasoline be in the year 2011? How did you arrive at your answer?

  • Math/116 -

    sorry im not sure.

  • Math/116 -

    Thank you for your help

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