Find the focus and the directrix of the parabola.x = 2y2 + 8y + 5
A. 
; x = - 
B. 
; x = - 
C. (-1, -3); x = -5
D. (-5, -3); x = -7
Answer: B
Mathematics
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Prove that the equation is an identity.
= - cos12k cot 2k
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The function graphed is of the form y = a sin bx or y = a cos bx, where b > 0. Determine the equation of the graph.
A. y = -4 sin (2x)
B. y = -4 cos 
C. y = 4 cos (2x)
D. y = -4 cos (2x)
Mathematics
Solve the problem.Data representing the price and quantity demanded for hand-held electronic organizers were analyzed every day for 15 days. The logarithmic function of best fit to the data was found to be 
Use this to predict the number of hand-held electronic organizers that would be demanded if the price were $275.
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Mathematics
Find the area of the parallelogram below.
Mathematics