The graphing calculator screens show a system and the point of intersection. Choose the screen which best represents the given system.y = 2.5x + y = 5
A. 
B. 
C. 
D. 
Answer: D
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Solve the proportion equation.
= 
A. 9 ft B. 7 ft C. 4 ft D. 6 ft
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(536?t) cos(2418?t) B. y = 2 sin(395?t) cos(2277?t) C. y = 2 sin(2418?t) cos(536?t) D. y = 2 sin(2277?t) cos(395?t)
Plot the point given in polar coordinates.(2, 0°) 
A. 
B. 
C. 
D. 
Solve the problem.Sam Rush bought 195 shares of ABC Electronics at 
per share and 99 shares of Wisconsin Power at 
per share, and 374 shares of Peter's Manufacturing at 29 per share. Find the total amount that he paid, assuming he was charged a commission of 1%.
A. $18,685.67 B. $18,668.87 C. $20,533.70 D. $18,853.67