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Linear Functions

SAT Math· difficulty 3/5

A cell phone account starts with 10001000 MB. The user consumes 5050 MB per day. Which function gives MB remaining after dd days?

  • A

    M(d)=50−1000dM(d) = 50 - 1000d

  • B

    M(d)=50d−1000M(d) = 50d - 1000

  • C

    M(d)=1000−50dM(d) = 1000 - 50d

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  • D

    M(d)=1000+50dM(d) = 1000 + 50d

Explanation

Start at 10001000, decrease by 5050 each day.

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