1.   What is the constant rate of change between the quantities in the table?
   
    A. 2 gal per minute B. -10 gal per minute
    C. -20 gal per minute D. -2 gal per minute
    Hint

  2.   What is the constant rate of change between the quantities in the table?
   
    A. 60 calories per minute B. 15 calories per minute
    C. 4 calories per minute D. 40 calories per minute
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  3.   What is the constant rate of change between the quantities in the table?
   
    A. 2 legs per dog B. 4 legs per dog
    C. 4 dogs per leg D. 40 legs per dog
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  4.   What is the constant rate of change shown in the graph?
   
    A. 55 mph B. 130 mph
    C. 65 mph D. 70 mph
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  5.   What is the constant rate of change shown in the graph?
   
    A. 5 B. 4
    C. 6 D. 3
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