Express the number in scientific notation.0.000315
A. 3.15 × 10-3
B. 3.15 × 104
C. 3.15 × 10-4
D. 3.15 × 10-5
Answer: C
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Solve the problem.The concentration of a drug in the bloodstream, measured in milligrams per liter, can be modeled by the function, 
where t is the number of minutes after injection of the drug. When will the drug be at its highest concentration? Approximate your answer rounded to two decimal places.
A. t = 4 minutes after the injection is given B. t = 3.65 minutes after the injection is given C. t = 0.55 minutes after the injection is given D. at the time of injection
Solve the problem.When the temperature stays the same, the volume of a gas is inversely proportional to the pressure of the gas. If a balloon is filled with 95 cubic inches of a gas at a pressure of 14 pounds per square inch, find the new pressure of the gas if the volume is decreased to 19 cubic inches.
A. 65 lb/in.2
B. 70 lb/in.2
C. 56 lb/in.2
D. 
lb/in.2
Perform the indicated operations.
? 
÷ 
A. 
B. 
C. 
D. 
Divide, if possible.0 ÷ (-5)
A. -5 B. 0 C. 5 D. Not defined