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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Provide an appropriate response.Solve the following quadratic equation: x2 + 7x = 0
Fill in the blank(s) with the appropriate word(s).
Mathematics
Solve the problem.Suppose the sales of a particular brand of appliance satisfy the relationship 
where S(x) represents the number of sales in year x, with 
corresponding to 1982. Find the number of sales in 
.
A. 7300 B. 14,600 C. 7060 D. 14,360
Mathematics
Simplify the expression using the order of operations.(-6)2 - 102
A. 136 B. -32 C. -64 D. 64
Mathematics
Solve the equation by completing the square.49x2 + 84x + 11 = 0
A. 
B. 
C. 
D. 
Mathematics