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) = 240 cos 2?x + 600, where x is time in years, measured from January 1. Find R'(x) for March 1st.
A. 0
B. -240?
C. -240?
D. -240?
Answer: B
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Write the function in the form y = f(u) and u = g(x). Then find dy/dx as a function of x.y = (-2x + 7)5
A. y = 5u + 7; u = x5; 
= -10x4
B. y = u5; u = -2x + 7; 
= 5(-2x + 7)4
C. y = u5; u = -2x + 7; 
= -2(-2x + 7)5
D. y = u5; u = -2x + 7; 
= -10(-2x + 7)4
Refer to the figure to answer the question. Line DH is parallel to line IM. Line BO is perpendicular to line DH.
Which of the following is a true statement?
A. m?JEF = m?LGH B. m?PLM + m?LGH = 180° C. ?FGL and ?GLK are supplementary. D. ?FGL and ?LGH are complementary.
Find the measure of the indicated angle.?DGE
A. m?DGE = 41° B. m?DGE = 106° C. m?DGE = 25° D. m?DGE = 49°
Use the graph to find the average rate of change.
Minutes Cellular Phone is Used
A. $0.17 per min B. $6.00 per min C. $1.75 per min D. $0.40 per min