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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Express the vector as a product of its length and direction. -
i - 
j + 
k
A. 
B. 
C. 
(-i - j + k)
D. 
Mathematics
Estimate the answer by rounding as indicated.Estimate by rounding to the nearest hundred.
A. 511,688 B. 511,700 C. 1500 D. 560,000
Mathematics
Add or subtract as indicated. Write the answer in simplest form.
- 
A. 
B. 
C. 
D. 
Mathematics
Write an equation for the line. Give the final answer in slope-intercept form.Through (6, -3) and (-6, 8)
A. y = - 
x + 
B. y = 
x + 
C. y = 
x + 
D. y = - 
x + 
Mathematics