Solve the problem.It is estimated that the total value of a stamp collection is given by the formula 
where t is the number of years from now. If the inflation rate is running continuously at 4% per year so that the (discounted) present value of an item that will be worth $v in t years' time is given by 
Sketch the graph of the discounted value as a function of time at which the stamp collection is sold. At what value of t is the present value increasing most rapidly?
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A. t = 21.05
B. t = 19.05
C. t = 24.15
D. t = 18.75
Answer: A
Mathematics
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Estimate the magnitude of the error involved in using the sum of the first four terms to approximate the sum of the entire series.
A. 
< 4.12 × 10-3
B. 
< 1.23 × 10-2
C. 
< 
D. 
< 1.37 × 10-3
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Find a general term an for the arithmetic sequence.a1 = 1, d = 4
A. an = 4n - 3 B. an = n + 4 C. an = 1(4)n-1 D. an = 3n - 4
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Use the given graph to find the values of t that produce the graph in the given quadrant.x = 2 - 
, y = t + 1, -6 ? t ? 6
Quadrant IV
A. -1 ? t ? -2 B. -2 ? t ? 2 C. -6 ? t ? -1 D. 2 ? t ? 6
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Divide. Write the answer in lowest terms and as a whole or mixed number where possible.
÷ 
A. 1
B. 
C. 
D. 2
Mathematics