Find the least common denominator of the rational expressions.
and 
A. 30x7
B. 30x3
C. 6x7
D. 30x10
Answer: A
Mathematics
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Provide an appropriate answer.Find 
when r = -2 and s = 5 if w(x, y, z) = xz + y^2, x = 5r + 8, y = r + s, and z = r - s.
A. 
= -35
B. 
= -31
C. 
= 5
D. 
= -23
Mathematics
A solution of 0.5 N acid is known to be 95% ionized. Find [H+], the hydrogen ion concentration.
A. 0.02375 mol/L H+ B. 2.375 mol/L H+ C. 0.95 mol/L H+ D. 0.2375 mol/L H+
Mathematics
Solve the system of equations by the substitution method.5x - 6y = 2 - 5x2x + 6y = x + 5y + -3
A. {(-1, 2)}
B. {(-1, -2)}
C. {(0, 2)}
D. 
Mathematics
Write the improper fraction as a mixed number or an integer.- 
A. -6
B. -5
C. -7
D. -6
Mathematics