Solve the problem.A sample of 1,000 g of lead-210 decays to polonium-210 according to the function given by 
where t is time in years. What is the amount of the sample after 70 years? Round the answer to the nearest gram.
A. 77 g
B. 106 g
C. 9,393 g
D. 29 g
Answer: B
Mathematics
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Refer to the table to answer the question.
Which category and year shows the smallest absolute change?
A. Training '98-'99 B. Catalog '99-'00 C. Sales, '99-'00 D. Catalog, '98-'99
Mathematics
Write an equation for the graph given. The graph represents an exponential function f with base 2 or 3, translated and/or reflected.
A. -3-x + 1 B. -3x + 1 C. 3-x + 1 D. -3-x - 1
Mathematics
Simplify the radical.
A. -8 B. 22.627 C. 11.314 D. not a real number
Mathematics
Solve the problem.The annual rainfall in Maine is a random variable with probability density function defined by 
for x in 
Find the standard deviation.
A. 1.270 B. 1.265 C. 0.903 D. 1.597
Mathematics