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Math help

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A gas station charges $2.19 per gallon of gas. Use function notation to describe the relationship between the total cost C(g) and the number of gallons purchased g.
C(g) = –2.19g
g = 2.19C(g)
C(g) = g + 2.19
C(g) = 2.19g

Please tell me the explination and the answer.

  • Math help -

    C(g) = 2.19g

  • Math help -

    I think this is correct.

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