Evaluating Algebraic Expressions

what is the value of this expression, 2X + 3; if x = 12

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Evaluate 5 ( n + 3 ) - 7n, when n = 6

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Evaluate 7xy; when x = 3, y = 2

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Evaluate 3m - y ; when m =8, y = 10

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What is the perimeter of a square that has a side of 3x + 4 when x = 2

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What is the value of 4(x + 2y); when x = 3, y = 5

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 $What\ is\ the\ value\ of\ \frac{x}{y}$  when x =32, y=4

 What is the value of  

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 $What\ is\ the\ value\ of\ y^2\ +\ x\ ^2\ ;\ when\ x=3,\ y\ =4$  

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What is the value of 3x + 5 + 2y + 6, when x = 5, y =3

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 $what\ is\ the\ value\ of\ a^{2^{ }}\ \div\ b^2\ when\ a\ =\ 8,\ b\ =2\ ^{ }$  

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