Solve the equation after making an appropriate substitution.x4 - 50x2 + 49 = 0

A. {-49, 49}
B. {-1, 1, -7, 7}
C. {-50, 50}
D. {-7, 7}

Answer: B

Mathematics

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A. $10.80 B. $1080.00 C. $8.10 D. $129.60

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Write as a single logarithm. loga x - 2 loga z +  loga y

A. loga (z2 )
B. loga ( - z2 + )
C. loga 
D. loga 

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Simplify the expression.4(x + 8) - 1

A. 4x + 33 B. x + 31 C. 4x + 7 D. 4x + 31

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Evaluate the polynomial at the given value(s) of the variable(s).a2b + ab2a = 5, b = -3

A. 210 B. 30 C. -30 D. -150

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Mathematics