Determine whether the following is a difference of squares.81 - y2
A. No
B. Yes
Answer: B
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Find a rectangular equation for the plane curve defined by the parametric equations.x = 8 sin t, y = 8 cos t; 0 ? t ? 2?
A. y2 - x2 = 64; for x in -? < x < ?
B. y = x2 - 9; for x in -2 ? x ? 2
C. y = 
= 64; for x in -? < x < ?
D. x2 + y2 = 64; for x in -8 ? x ? 8
Express the sum or difference as a product of sines and/or cosines.cos (6?) + cos (4?)
A. 2 sin (5?) sin ? B. 2 cos (5?) cos ? C. 2 cos (5?) D. 2 cos (5?) sin ?
What is a triangle with three angles of equal measure called? ?
A. right B. scalene C. equilateral D. isosceles E. none of these
Solve the problem.The total sales in dollars of some small businesses fluctuates according to the equation 
where x is the time in months, with x = 1 corresponding to January, 
and 
Determine the month with the greatest total sales and give the sales in that month.
A. June; $7700 B. December; $10,700 C. September; $4700 D. March; $10,700