Solve the problem.A tank contains 100 gal of fresh water. A solution containing 2 lb/gal of soluble lawn fertilizer runs into the tank at the rate of 1 gal/min, and the mixture is pumped out of the tank at the rate of 
Find the maximum amount of fertilizer in the tank and the time required to reach the maximum.
A. 48 pounds, 60 minutes
B. 50 pounds, 50 minutes
C. 48 pounds, 40 minutes
D. 60 pounds, 40 minutes
Answer: B
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Solve using the principle of zero products.
z
= 0
A. - 
, 
B. 
, 
C. - 
, 0
D. 
, 0
Perform the indicated operations. Write the answer in simplest form.
? 
A. 
B. 
C. 
D. 
Solve the problem.A certain store has a fax machine available for use by its customers. The store charges $2.50 to send the first page and $0.70 for each subsequent page. Use an inequality to find the number of pages that can be faxed for $10.20.
A. 61 pages or fewer B. 15 pages or fewer C. 4 pages or fewer D. 12 pages or fewer
Solve the problem.A woman works out by running and swimming. When she runs, she burns 7 calories per minute. When she swims, she burns 10 calories per minute. She wants to burn at least 490 calories in her workout. Graph an inequality that describes the situation. Let x represent the number of minutes running and y the number of minutes swimming. Because x and y must be positive, limit the graph to quadrant I only.
A. 
B. 
C. 
D. 