Find the exact value of the trigonometric expression without the use of a calculator.sin 20° cos 40° + cos 20° sin 40°
A. 
B. 
C. 
D. 
Answer: B
Mathematics
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Solve the problem.Find a unit vector perpendicular to plane PQR determined by the points 
and 
A. ± 
B. ± 
C. ± 
D. ± 
Mathematics
Write an inequality involving the variable x that describes the set of numbers graphed.
A. -2 < x < 2 B. -2 ? x ? 2 C. -2 < x ? 2 D. -2 ? x < 2
Mathematics
Evaluate the series, if it converges.4 + 5 + 
+ 
+ . . .
A. 16 B. - 20 C. Does not converge D. 20
Mathematics
Find the equation of the line described, and express your answer in the specified form.Parallel to the line y = -3x; passes through the point (2, 3); slope-intercept form
A. y = -3x + 9 B. y = -3x - 9 C. y = -3x D. y - 3 = -3x - 2
Mathematics