\

The expression is  \ \

                           (Replace r and t with 11 and 7)

To simplify the expression follow the order of operations: (PEMDAS)

1.      Evaluate the expressions inside Brackets/Parenthesis (P).

2.      Evaluate Powers/Exponents (E).

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

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

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

“Please Excuse My Dear Aunty Sally”

In the given expression there are grouping symbols.

First operation is parenthesis.

                                    (Subtract: )

Next operation is evaluating the power.

                                      (Evaluate power: )              

The value of the expression is .