Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°
A. 
B. 
C. 
D. 
Answer: D
Mathematics
You might also like to view...
Convert to fractional notation.0.2%
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.The population of a small town can be modeled by P = -33t + 12,800, where t is the number of years since 2010. Interpret the slope of the graph of this function as a rate of change.
A. The population of the town is decreasing by 12,800 people per year. B. The population of the town is increasing by 12,800 people per year. C. The population of the town is increasing by 33 people per year. D. The population of the town is decreasing by 33 people per year.
Mathematics
Solve the equation. Give the exact solution or solutions.log(4x - 3) = log 9 - log(x - 3)
A. 
B. 
C. 
D. ?
Mathematics
Find the real or imaginary solutions by completing the square.2x2 - 4x - 6 = 0
A. 
B. 
C. 
D. 
Mathematics