Linear Functions

SAT Math· difficulty 4/5

A water tank initially has 200 gal. Water flows in at 12 gal/min and out at 5 gal/min. Volume after tt minutes:

  • A

    V=7t+12V = 7t + 12

  • B

    V=200+17tV = 200 + 17t

  • C

    V=200+7tV = 200 + 7t

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  • D

    V=2007tV = 200 - 7t

Explanation

Net rate: 125=712 - 5 = 7 gal/min added.

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