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) = 40 cos 2?x + 600, where x is time in years, measured from January 1. Find R'(x) for March 1st.
A. -40?
B. 0
C. -40?
D. -40?
Answer: C
Mathematics
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Provide an appropriate response.Evaluate 82 + 4 - 9 following the order of operations without using a calculator.
A. 59 B. 21 C. 11 D. 69
Mathematics
Graph the solution set of the system of inequalities or indicate that the system has no solution.1 ? x < 3
A. 
B. 
C. 
D. 
Mathematics
Differentiate. y = cos (cos (3x))
What will be an ideal response?
Mathematics
Fill in the blank with one of the words or phrases listed below. 
A(n) 
of an equation is a number that when substituted for a variable makes the equation a true statement.
A. negative B. positive C. multiplication D. solution
Mathematics