If it isnt a number it is probably an operation. After you have done B and O just go from left to right doing any D or M as you find them. The order of operations From left to right start with division and multiplication and continue with addition and subtraction.
Perform all operations within parantheses or other grouping symbols Simplify expressions involving exponents.
Order of Operations PEMDAS Operations Operations mean things like add subtract multiply divide squaring etc. The order of operations is read from left to right. More than one bracket. A ddition and S ubtraction left-to-right Divide and Multiply rank equally and go left to right.