1.   Solve .
    A. 40 B. 10
    C. 2.5 D. 320
    Hint

  2.   Solve .
    A. 30 B. 20
    C. 35 D. 25
    Hint

  3.   Is a proportion? Explain.
    A. Yes, because 2 × 9 = 8 × 3.
    B. No, because 2 × 9 8 × 3.
    C. Yes, because 2 × 3 = 8 × 9.
    D. No, because 2 + 3 = 8 + 9.
    Hint

  4.   Find k if = .
    A. 2 B. 0.5
    C. 4.5 D. 60.5
    Hint

  5.   Determine whether = form a proportion. Explain.
    A. No, because 8 × 15 ? 10 × 12. B. Yes, because 8 × 15 = 10 × 12.
    C. Yes, because 8 × 12 ? 10 × 15. D. No, because the ratios are not equal.
    Hint



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