Solve the problem.The amount of a certain radioactive isotope present at time t is given by 
grams, where t is the time in years that the isotope decays. The initial amount present is 400 grams. How many grams remain after 20 years? Round to the nearest hundredth.
A. 379.25 g
B. 397.87 g
C. 234.78 g
D. 681.48 g
Answer: C
Mathematics
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Integrate the given expression.
dx
A. x + 7C
B. -21x + C
C. 7x3 + C
D. - 
+ C
Mathematics
+ 
A. 
B. 7
C. 
D. 
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Write the whole number in standard form.Last year the population of a city increased by two thousand, one hundred eight.
A. 2108 B. 2180 C. 21,008 D. 2018
Mathematics
For the pair of functions, find the indicated domain.f(x) = x2 - 9, g(x) = 2x + 3Find the domain of f/g.
A. (-3, 3)
B. 
? 
C. (-?, ?)
D. 
Mathematics