Solve.Suppose that $12,000 is invested at an interest rate of 5.8% per year, compounded continuously. What is the doubling time?
A. 12 yr
B. 13 yr
C. 11 yr
D. 2 yr
Answer: A
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Simplify the expression.sin4x - cos4x + cos2x
A. 1 B. 0 C. sin2x D. cos2x
Solve the problem.Find the length of a rectangular lot with a perimeter of 76 meters if the length is 4 meters more than the width. 
A. 42 m B. 17 m C. 21 m D. 38 m
Find the weighted average.A student earned grades of 80, 85, 78, and 79 on her four regular tests. She earned a grade of 79 on the final exam and 86 on her class projects. Her combined homework grade was 85. The four regular tests count for 40% of the final grade, the final exam counts for 30%, the project counts for 10%, and homework counts for 20%. What is her weighted mean grade? Round to one decimal place.
A. 82.1 B. 80.2 C. 81.5 D. 81.7
Use transformations of the graph of y = x4 or y = x5 to graph the function.f(x) = - 
x5 
A. 
B. 
C. 
D. 