Solve the problem.The intensity of the reaction to a certain drug, in appropriate units, is given by 
where t is time (in hours) after the drug is administered. Find the average intensity during the 4th hour.
A. 130e-0.3 + 100e-0.4
B. -0.7e-0.3 - 140e-0.4
C. 140e-0.4 - 150e-0.5
D. 130e-0.3 - 140e-0.4
Answer: D
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Solve the problem.In a chemical reaction, the rate at which the amount of a reactant changes with time is proportional to the amount present, such that 
, when t is measured in hours. If there are 
of reactant present when t = 0, how many grams will be left after 
? Give your answer to the nearest tenth of a gram.
A. 5.9 g B. 4 g C. 2 g D. 0.1 g
Write each expression using the LCD as the denominator.
, 
, 
A. 
, 
, 
B. 
, 
, 
C. 
, 
, 
D. 
, 
, 
Solve the problem.Henry played golf last tuesday. He had a net score of 64 and a handicap of 10. Find Henry's gross score, G, using the equation N = G - H, where N is the net score and H is the handicap.
A. 76 B. 66 C. 74 D. 63
Find the average value of y = ?3t 2 + 5t over [?2, 1]. 18
What will be an ideal response?