Solve the problem.A construction crane lifts a bucket of sand originally weighing 
at a constant rate. Sand is lost from the bucket at a constant rate of
. How much work is done in lifting the sand 
? (Neglect the weight of the bucket.)
A. 9600 ft ? lb
B. 8700 ft ? lb
C. 7800 ft ? lb
D. 6900 ft ? lb
Answer: C
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Solve the problem.The rate of water usage for a business, in gallons per hour, is given by 
where t is the number of hours since midnight. Find the average rate of water usage over the interval 
A. 0.37 gallons per hour B. 4.37 gallons per hour C. 3.78 gallons per hour D. 3.63 gallons per hour
Provide an appropriate response.Give the number of solutions for 
> k if k < 0.
A. 2 B. An infinite number C. 0 D. 1
Provide an appropriate response.When depositing money into a checking account, a deposit slip is not needed.
A. True B. False
Solve the problem.A survey of 1,981 credit card users indicated that 911 had bought books online, 876 had bought music online, 439 had bought pet supplies online, 139 had bought both books and music, 200 had bought both books and pet supplies, 160 had bought both music and pet supplies, and 93 had bought all three. How many credit card users did not buy any of the three? How many bought either books or pet supplies but not music?
A. 161; 944 B. 161; 837 C. 254; 837 D. 161; 930