Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°
A. 
B. 
C. 
D. 
Answer: D
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Solve the problem.The graph below shows the decrease in the percentage of Canadians below the poverty level from 1992 to 1997. 
Assume that the rate of decrease continues for the next several years and can be modeled by a linear equation of the form 
Based on such a model, predict the percentage of Canadians below the poverty level in 2010.
A. 26.9% B. 29.0% C. 24.0% D. 56.3%
Convert the numeral to a numeral in base ten.15eight
A. 104 B. 48 C. 13 D. 23
Find the extreme values of the function subject to the given constraint.
A. Maximum: none; minimum: 2 at 
B. Maximum: none; minimum: 
at 
C. Maximum: none; minimum: 
at 
D. Maximum: none; minimum: 
at 
Verify the identity.cot (? - x) = - cot x
What will be an ideal response?