Write the product as a sum. cos 7x cos 3x
(a) cos 7x cos3 x
(b) [cos7x cos3x]/ 2
(c) [cos10x cos 4x]/ 2
(d) -[cos5x + cos 2x]/ 2
(e) none of these
(c) [cos10x cos 4x]/ 2
Mathematics
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Graph the function. Show at least one period.y = 4 cos
A. 
B. 
C. 
D. 
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Match the function with its graph.f(x) = log3 (-x)
A. 
B. 
C. 
D. 
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Solve the problem.Steve Nyren is paid on a salary-plus-commission basis. He receives $488 weekly in salary and a commission based on 1.1% of all weekly sales over $15,000. If he sold $18,100 in merchandise in one week, find his gross earnings for the week.
A. $522.10 B. $829.00 C. $34.10 D. $687.10
Mathematics
Determine whether the statement is true or false.The number 8 is a real number.
A. True B. False
Mathematics