Divide. Leave your answer in exponent form. Assume that all variables in any denominator are nonzero.
A. 6m23n6
B. 6n2
C. 54mn2
D. 6mn2
Answer: D
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Graph the set of points whose polar coordinates satisfy the given equation or inequality.r = 3
A. 
B. 
C. 
D. 
Solve the system using Gaussian elimination. 4x + 3y = -3 2x + 9y = 21
A. {(3, -3)} B. {(-3, 3)} C. ? D. {(-3, -3)}
Combine like terms.8x + 6x
A. 2x B. 14 C. 14x D. 4x
Solve the problem.On a Touch Tone phone, each button produces a unique sound. The sound produced is the sum of two tones and is given by 
and y = sin (2?ht), where l and h are the low and high frequencies (in hertz = Hz) associated with that button. 
The tone produced is thus given by y = sin (2?lt) + sin (2?ht). Write an expression that models the tone by pressing the "9" button as a product of sines and cosines.
A. y = 2 sin (625?t) cos (2329?t) B. y = 2 sin (2061?t) cos (357?t) C. y = 2 sin (2329?t) cos (625?t) D. y = 2 sin (357?t) cos (2061?t)