Linear Functions

SAT Math· difficulty 3/5

A spring stretches in proportion to weight. 5 lb stretches it 2 in. What weight stretches it 7 in?

  • A

    17.517.5 lb

    check_circle
  • B

    1515 lb

  • C

    2020 lb

  • D

    1717 lb

Explanation

k=5/2=2.5k = 5/2 = 2.5 lb per inch; 2.5×7=17.52.5 \times 7 = 17.5 lb.

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