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Linear Functions

SAT Math· difficulty 4/5

A freezer contains an item with temperature 2020°C. The temperature drops 1.51.5°C per minute. After how many minutes will the temperature first reach −10-10°C?

  • A

    1818

  • B

    2525

  • C

    1515

  • D

    2020

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Explanation

20−1.5t=−10⇒t=30/1.5=2020 - 1.5t = -10 \Rightarrow t = 30/1.5 = 20.

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