Solve the problem.Suppose that the amount in grams of a radioactive substance present at time t (in years) is given by A(t) = 170e-0.37t. Find the rate of change of the quantity present at the time when 
A. -9.1 grams per year
B. -6.8 grams per year
C. 9.1 grams per year
D. 6.8 grams per year
Answer: B
Mathematics
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Find the percent using a proportion. Round your answer to the nearest tenth if necessary.What percent of 187 feet is 10.7 feet?
A. 1747.7% B. 0.2% C. 5.7% D. 0.1%
Mathematics
Encode or decode the given message, as requested, numbering the letters of the alphabet 1 through 26 in their usual order.Use the coding matrix A = 
to encode the message LIFE.
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.Using the Maclaurin series for tan-1 x, obtain a series for 
.
A. 
B. 
C. 
D. 
Mathematics
Rewrite the following using radicals; then simplify if possible.274/3
A. 
= 243
B. 
= 81
C. 3
= 243
D. 4
= 81
Mathematics