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Linear Functions

SAT Math· difficulty 2/5

A phone plan: \25monthlyplusmonthly plus$0.05perminute.Costforper minute. Cost form$ minutes is:

  • A

    C=25m+0.05C = 25m + 0.05

  • B

    C=0.05(m+25)C = 0.05(m + 25)

  • C

    C=25.05mC = 25.05m

  • D

    C=0.05m+25C = 0.05m + 25

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Explanation

Per-minute rate 0.050.05 is slope; monthly fee 2525 is intercept.

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