math question

I have the equation 3f+2.50h=240 and I want to make a table of values with at least five possible combinations. How do I determine which combinations I should use?

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  1. You can pick any five you want.
    How about h - -20, -15, 0, 15 and 20?

    Solve for the f value in each case.

    For example, if h = 0, f = 80

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