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Linear Functions

SAT Math· difficulty 3/5

A phone plan costs \30permonthplusper month plus$0.10perminuteoverper minute over500minutes.Whatisthetotalmonthlycostminutes. What is the total monthly costCforformminutesifminutes ifm > 500$?

  • A

    C=30+0.1(m−500)C = 30 + 0.1(m - 500)

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  • B

    C=0.1m+500C = 0.1m + 500

  • C

    C=30+0.1(500−m)C = 30 + 0.1(500 - m)

  • D

    C=30+0.1mC = 30 + 0.1m

Explanation

Only the minutes over 500500 are charged at \0.10$.

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