1.   What is the constant rate of change between the quantities in the table?
   
    A. $10 per hour B. $40 per hour
    C. $1 per hour D. $5 per hour
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  2.   What is the constant rate of change between the quantities in the table?
   
    A. 4 legs per dog B. 4 dogs per leg
    C. 2 legs per dog D. 40 legs per dog
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  3.   What is the constant rate of change shown in the graph?
   
    A. 55 mph B. 65 mph
    C. 130 mph D. 70 mph
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  4.   What is the constant rate of change shown in the graph?
   
    A. 6 B. 5
    C. 3 D. 4
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  5.   What is the constant rate of change shown in the graph?
   
    A. 150 feet per minute B. -150 feet per minute
    C. -15 feet per minute D. 15 feet per minute
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