Evaluate.
cos (2x) + 2x sin (2x) +C
Mathematics
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Solve the exponential equation.5x = 15
A. 0.594 B. 1.099 C. 3.000 D. 1.683
Mathematics
Multiply and simplify any radicals in your answer. Assume that all variables represent positive real numbers.
A. 
B. 
C. 15
D. 
Mathematics
Solve the problem.Consider a retirement savings account where the monthly contribution is $100 for the first 15 years, is increased to $225 for the next 15 years, and then is increased once again to $325 for the last 10 years. The APR is always 5.4% compounded monthly. What is the value of the account at the end of 40 years? Round your answer to the nearest cent.
A. $257,880.02 B. $255,975.42 C. $266,356.93 D. $281,406.16 E. $264,452.33
Mathematics
Write the mixed number as an improper fraction.7
A. 
B. 
C. 
D. 
Mathematics