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) = 225 cos 2?x + 600, where x is time in years, measured from January 1. Find R'(x) for August 1st.
A. 0
B. 225?
C. 225?
D. 225?
Answer: B
Mathematics
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Graph the given line.x - 3.5 = 0
A. 
B. 
C. 
D. 
Mathematics
Find the length of the curve.The cardioid r = 8(1 - sin ?)
A. 96 B. 64? C. 64 D. 96?
Mathematics
Find the equation of the line tangent or normal (as indicated) to the given curve with the given slope.y = (4x - 7)3, normal line with slope - 
, x > 0
A. 12x - y - 14 = 0 B. x + 12y - 14 = 0 C. x - 12y - 14 = 0 D. 12x + y - 14 = 0
Mathematics
Solve the problem.A certain exotic sports car costs three hundred twelve thousand, nine hundred ninety-five dollars. Write as a number.
A. 3,209,950 B. 312,995,000 C. 312,995 D. 31,295
Mathematics