\"\"

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The expression is \"\".

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\"\"                          (Replace t and y with 4 and 2)

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To simplify the expression follow the order of operations:

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1.      Evaluate the expressions inside grouping symbols.

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2.      Evaluate powers.

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3.      Multiply and/or Divide in order from left to right.

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4.      Add and/or Subtract in order from left to right.

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A simple technique for remembering the order pf operations is turned into phrase

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“Please Excuse My Dear Aunty Sally”\"\"

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First operation is evaluating the power.

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\"\"                           (Evaluate the power: \"\")

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Next operation is multiplication.

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\"\"                                 (Multiply: \"\")            

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Next operation is addition.

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\"\"                                      (Add: \"\")\"\"

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The value of the expression is 22.