Solve the problem.Let f(x, y) = 2x - 10y2 - 8Find 
A. 2 - 10y2 - 8
B. 2x
C. 2
D. 2 - 20y
Answer: C
Mathematics
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Use the information given about the angle ?, 0 ? ? ? 2?, to find the exact value of the indicated trigonometric function.cos ? = - 
, 
< ? < ?Find cos(2?).
A. 
B. 
C. - 
D. - 
Mathematics
Answer the question.Express three consecutive integers, all in terms of x, if x is the largest integer.
Fill in the blank(s) with the appropriate word(s).
Mathematics
Solve the inequality.x2 + 7x ? 0
A. [0, 7] B. (-?, -7] or [0, ?) C. [-7, 0] D. (-?, 0] or [7, ?)
Mathematics
Solve the problem.The time T necessary to make an enlargement of a photo negative varies directly as the area A of the enlargement. If 24 seconds are required to make a 3-by-4 enlargement, find the time required for a 
enlargement.
A. 140 sec B. 280 sec C. 70 sec D. 210 sec
Mathematics