1.   What is the constant rate of change between the quantities in the table?
   
    A. $1 per hour B. $10 per hour
    C. $40 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. -10 gal per minute B. 2 gal per minute
    C. -2 gal per minute D. -20 gal per minute
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  3.   What is the constant rate of change between the quantities in the table?
   
    A. 15 calories per minute B. 4 calories per minute
    C. 40 calories per minute D. 60 calories per minute
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  4.   What is the constant rate of change shown in the graph?
   
    A. 130 mph B. 70 mph
    C. 55 mph D. 65 mph
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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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