Find the least common denominator of the rational expressions.
and 
A. 20(x - 1)(x + 1)
B. 4(x - 1)2(x + 1)
C. 20(x - 1)2(x + 1)
D. 80(x - 1)2(x + 1)
Answer: C
Mathematics
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A. 
B. 
C. 
D. 
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Graph the system of inequalities, and find the coordinates of the vertices.3y - x ? 9,y + 2x ? 10,y ? 0
A. 
B. 
C. 
D. 
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Change the logarithmic expression to an equivalent expression involving an exponent.ln y = 7
A. 7e = y B. ey = 7 C. y7 = e D. e7 = y
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Solve the equation.
+ 
= -1
A. {5}
B. 
C. ?
D. {0}
Mathematics