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Linear Functions

SAT Math· difficulty 3/5

A baby pool initially holds 44 gallons. Water drains at a rate of 0.50.5 gallons per minute. Which function gives the gallons remaining after tt minutes?

  • A

    V(t)=4+0.5tV(t) = 4 + 0.5t

  • B

    V(t)=4−0.5tV(t) = 4 - 0.5t

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  • C

    V(t)=−4−0.5tV(t) = -4 - 0.5t

  • D

    V(t)=0.5−4tV(t) = 0.5 - 4t

Explanation

Start at 44, decrease by 0.50.5 each minute: V(t)=4−0.5tV(t) = 4 - 0.5t.

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