Solve the problem.The revenue for a small company is given by the quadratic function 
where t is the number of years since 1998 and r(t) is in thousands of dollars. If this trend continues, find the year after 1998 in which the company's revenue will be $2185 thousand. Round to the nearest whole year.
A. 2009
B. 2011
C. 2010
D. 2020
Answer: A
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Solve the problem.The sum of the percentages 31.542%, 17.467%, 22.42%, 12.861%, and 15.71% is 100.000%. Adjust the list so that there are no fractional parts. The following table shows the numbers truncated and the discarded portions.
A. 31%, 17%, 22%, 13%, 15% B. 31%, 17%, 22%, 12%, 16% C. 32%, 17%, 22%, 13%, 16% D. 32%, 18%, 22%, 13%, 16%
Solve the problem.The demand function for a certain book is given by the function 
Find the marginal demand 
A. D'(p) = -0.204pe-0.004p-1 B. D'(p) = -0.204e-0.004p C. D'(p) = 0.204e-0.004p D. D'(p) = -0.004e-0.004p
Simplify the radical expression. Assume that variables represent positive numbers.
A. ±6 B. 36 C. 15 D. 6
Solve the differential equation.
y" + 10y' + 41y = 0