Order of Operations, Simplifying, Evaluating Algebraic Expressions

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Use order of operations to evaluate this numerical expression.

Use order of operations to evaluate this numerical expression.

Use order of operations to evaluate this numerical expression.

Use order of operations to evaluate this numerical expression.

What is the value of this expression? 
31 + 5² - 6

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Evaluate when a = 15: 2(a - 5) + 2

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• subtract 5 from 9

• subtract 9 from 5

• divide 12 by 4

• multiply 12 times 4

Evaluate 2a + 4b 
if a = 10     and    b = 6

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Evaluate: 2(y - z)² when y=5 and z= -2

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