Order of Operations:

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

1.      Evaluate the expressions inside the Parenthesis/Brackets (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"

The expression is

             (Substitute: )

Apply the order of operations (PEDMAS).

First operation is evaluating expression inside the brackets.

                (Add: )

                     (Multiply:  )

                                   (Add: )

Next operation is addition.

= 10.5                                       (Add: )

The value of the expression is 10.5.