Find the exact area of the surface obtained by rotating the given curve about the x-axis.
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Give the rectangular coordinates for the point.(8, 225°)
A. (-4?, -4?)
B. (-4
, -4
)
C. (4
, 4
)
D. (-4
, -4
)
Write the number in standard form.7.21 × 10-4
A. -721,000 B. 0.0000721 C. 0.00721 D. 0.000721
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
Match the graph with its corresponding function.
A. g(x) = 4x2 B. g(x) = x2 - 4 C. g(x) = (x - 4)2 D. g(x) = x2 + 4