Tell whether a linear model or a quadratic model is appropriate for the data. If a quadratic model is appropriate, then decide also whether the lead coefficient should be positive or negative.
A. Quadratic; leading coefficient negative
B. Quadratic; leading coefficient positive
C. Linear
Answer: C
Mathematics
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A. 0
B. undefined
C. 
D. e
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Write the complex number in rectangular form using exact values if possible. Otherwise, round to one decimal place.5
A. 
+ 
i
B. 
+ 
i
C. 
+ 
i
D. 
+ 
i
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Find the exact value of the expression if ? = 60°. Do not use a calculator.f(?) = cos ?Find f(?).
A. 
B. 
C. 
D. 
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Differentiate.y = ln (xn)
A. 
B. n ln (xn-1)
C. 
D. 
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