Cole can use the fomrula c=3.99n to find the cost c of buing n notebooks . if Cole has $15 to spend, which is a reasonable range for c=3.99n?

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  1. c ≥ 3.99n

    15 ≥ 3.99n

    Divide both sides by 3.99.

    3.76 ≥ n

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