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 9 key as a product of sines and cosines.
A. y = 2 sin (357?t) cos (2061?t)
B. y = 2 sin (2061?t) cos (357?t)
C. y = 2 sin (2329?t) cos (625?t)
D. y = 2 sin (625?t) cos (2329?t)
Answer: C
Mathematics
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Simplify.-5-4
A. 625
B. -625
C. - 
D. 
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Find the first three nonzero terms of the Taylor expansion for the given function and value of a.sin x 
A. 
- 
2 + 
3 - ...
B. 
C. 
- 
2 + 
3 - ...
D. 
Mathematics
The table shown was generated by a graphics calculator. The expression y1 represents f(x).
If f(x) = -7, then x = ?
A. 0 B. 2 C. -2 D. Cannot be determined
Mathematics
Find an equation for the line with the given properties.Perpendicular to the line -5x - 3y = 13; containing the point (1, -1)
A. -3x + 5y = -8 B. -5x + 3y = -8 C. -3x - 5y = 13 D. -3x - 5y = -8
Mathematics