Solve the problem.The revenue received from the sale of electric heaters is seasonal, with maximum revenue in the winter. Let the revenue received from the sale of heaters be approximated by R(x) = 90 cos 2?x + 600, where x is time in years, measured from January 1. Find R'(x) for March 1st.
A. -90?
B. -90?
C. -90?
D. 0
Answer: B
Mathematics
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Find the present value for the given future amount. Round to the nearest cent.A = $19,200, 9 years r = 6% compounded annually
A. $12,046.32 B. $7835.55 C. $32,438.00 D. $11,364.45
Mathematics
Solve the equation by the method of your choice. Simplify solutions, if possible.5x2 - 9x - 2 = 0
A. 
B. {-5, 2}
C. 
D. 
Mathematics
Solve the inequality. Write the solution in interval notation.
< 7
A. (-?, -9) ? 
B. (-?, -9) ? (9, ?)
C. 
D. 
? (9, ?)
Mathematics
Triangle ABC is described below. Find all possible values for side c.
?
?
cm, 
cm
?
Round to the appropriate number of significant digits after all computations are complete.
?
__________ cm
What will be an ideal response?
Mathematics