After determining whether the variation model below is of the form 
or 
, find the value of k.
x
20
40
60
80
100
y
?
?
?
?
A. 
B. 
C. 
?
D. 
E. 
?
Answer: E
Mathematics
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What will be an ideal response?
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The function graphed is of the form 
or 
where d is the least possible positive value. Determine the equation of the graph.
A. sin x - 
B. sin 
C. cos 
D. sin 
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Perform the indicated operation. If possible, simplify.Multiply:
A. cos2 x - sin2 x - 1 B. cos2 x - sin x + 1 C. 2cos2 x + cos x - 1 D. 2cos2 x - cos x - 1
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Find the sum or difference.(7x6 + 6x8 - 7 + 4x7) - (-1 + 8x7 + 8x8 - 9x6)
A. -2x8 - 4x7 + 16x6 - 6 B. 14x8 + 12x7 - 2x6 - 8 C. 14x8 + 12x7 - 2x6 - 6 D. -2x8 + 12x7 - 2x6 - 8
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