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Linear Functions

SAT Math· difficulty 4/5

The depth of water in a tub follows d(t)=12−0.4td(t) = 12 - 0.4t inches. After how many minutes is the tub empty?

  • A

    3636

  • B

    2424

  • C

    2828

  • D

    3030

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Explanation

12−0.4t=0⇒t=3012 - 0.4t = 0 \Rightarrow t = 30.

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