Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Find and correct the mistake.
What will be an ideal response?
Mathematics
Find the requested ratio in decimal notation rounded to the nearest thousandth.At the opening night of a theater production, there are 457 women and 264 men in the audience. For this set of people, what is the ratio of women to the total number of people?
A. 0.634 B. 1.731 C. 0.002 D. 0.366
Mathematics
Find the equation that the given graph represents.
A. f(x) = x4 - 2x2 - 3x + 12 B. f(x) = -3x3 - 10x2 + 5x + 12 C. f(x) = 2x3 - 12x2 - 5x - 12 D. f(x) = 3x2 - 5x + 12
Mathematics
Write the quotient in the standard form.
A. 
- 
i
B. 
- 
i
C. 
+ 
i
D. 
+ 
i
Mathematics