Solve with calculator.The formula 
models the duration of a storm, D, in hours, in terms of the diameter of the storm, x, in miles. Use a calculator to determine the duration of a storm with a diameter of 12 miles. Round to the nearest hundredth.
A. 0.77 hours
B. 2.91 hours
C. 0.24 hours
D. 41.57 hours
Answer: B
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Evaluate or simplify the given expression.cos (cot-1 x)
A. 
B. 
C. 
D. 
Use Descartes' Rule of Signs to determine the possible number of positive real zeros and the possible number of negative real zeros for the function.f(x) = 6x3 - 8x2 + 8x + 5
A. 
B. 
C. 
D. 
Solve the problem.Consider a retirement savings account where the monthly contribution is $125 for the first 15 years, is increased to $250 for the next 20 years, and then is increased once again to $300 for the last 5 years. The APR is always 6.0% compounded monthly. What is the value of the account at the end of 40 years? Round your answer to the nearest cent.
A. $339,049.09 B. $338,059.30 C. $343,032.07 D. $342,042.28 E. $335,066.11
Combine like terms when possible. 2x6 + 5x3 - 5x6
A. 2x15 B. 2x3 C. -3x6 + 5x3 D. cannot be simplified