Linear Functions

SAT Math· difficulty 5/5

The weight WW of a metal beam varies directly with its length LL. A 6-ft beam weighs 14.4 lb. A 9.5-ft beam weighs:

  • A

    21.221.2 lb

  • B

    22.822.8 lb

    check_circle
  • C

    22.422.4 lb

  • D

    22.022.0 lb

Explanation

Rate =14.4/6=2.4= 14.4/6 = 2.4 lb/ft; 2.4×9.5=22.82.4 \times 9.5 = 22.8.

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