Write the expression in simplest form. If a radical appears in the denominator, rationalize the denominator.

A.  
B.  
C.
D.  

Answer: D

Mathematics

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Find the real solutions of the equation.x4 - 5x2 + 4 = 0

A. {-4, 4} B. {-1, 1, -2, 2} C. {-5, 5} D. {-2, 2}

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Solve the system by substitution.x = 3y + 7y = x - 5

A. (-4, -1) B. (-4, 1) C. (4, -1) D. (4, 1)

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Solve the problem.Roberto's subtotal at Scramble's Electronics is  The sales tax on these items is  What was Roberto's total bill?

A. $17.52 B. $16.52 C. $17.62 D. $16.62

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Find the period and amplitude. ? y = 7 sin 40x ?

A. Period: ?; Amplitude: -7
B. Period: ?; Amplitude: 
C. Period: ; Amplitude: 
D. Period: 2?; Amplitude: 1



E. Period: ; Amplitude: 7

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Mathematics