Solve.
- 
= 
A. - 
B. - 
C. - 
D. 0
Answer: C
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Solve the problem.The sound produced by touching each button on a touch-tone phone is described by y = sin 2?lt + sin 2?htwhere l and h are the low and high frequencies (cycles per second) in the figure shown.
Describe the sound emitted by touching the 0 key as a product of sines and cosines.
A. y = 2 sin(395?t) cos(2277?t) B. y = 2 sin(536?t) cos(2418?t) C. y = 2 sin(2418?t) cos(536?t) D. y = 2 sin(2277?t) cos(395?t)
Factor the expression completely. If the polynomial is prime, state this as your answer.-u2 + y2
A. (y - u)(y + u) B. (y2 - u)(y2 + u) C. prime D. (y - u)(y - u)
Find the domain and range of the function.f(x) = 9 - x2
A. Domain: (-?, 9]; Range:[-9, ?) B. Domain: (-?, ?); Range: (-?, 9] C. Domain: (-?, ?); Range:(-?, -9] D. Domain: (-?, ?); Range:[9, ?)
Identify the equation without applying a rotation of axes.x2 + 12xy + 36y2 + 4x + 2y + 3 = 0
A. circle B. ellipse C. parabola D. hyperbola