Solve the problem.On a Touch-Tone phone, each button produces a unique sound. The sound produced is the sum of two tones, given by y = sin (2?lt) and y = sin (2?ht)where l and h are the low and high frequencies (cycles per second) shown on the illustration.
The sound produced is thus given by y = sin (2?lt) + sin (2?ht)Write the sound emitted by touching the 4 key as a product of sines and cosines.
A. y = 2 sin (439?t) cos (1,979?t)
B. y = 2 sin (2,106?t) cos (566?t)
C. y = 2 sin (566?t) cos (2,106?t)
D. y = 2 sin (1,979?t) cos (439?t)
Answer: D
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A. ?Prime factor 8 and 10 and find the LCM. B. ?Find the union of the prime factors of 8 and 10: LCM concept C. ?Prime factor 8 and 10 and find the GCF. D. ?Find the smallest number that both 8 and 10 go into: LCM concept E. ?Add 8's together and add 10's together until you find a common sum: LCM concept
Translate from English to an algebraic expression or equation, whichever is appropriate. Let the variable x represent the number.A number increased by 
of itself
A. 2x + 
B. x - 
x
C. x + 7x
D. x + 
x
Solve the problem. Round to the nearest dollar or tenth of a percent when necessary.A store sells an item for $460 each. If this is a 68.9% markup on the selling price, find the equivalent markup percent on cost.
A. 221.5% B. 40.8% C. 131.2% D. 460%
Indicate whether the statement is true always, sometimes, or never.The sum of two imaginary numbers is an imaginary number.
A. Always B. Sometimes C. Never