What four-steps should be used in evaluating expressions? Can these steps be skipped or rearranged? Explain your answers with examples.

Question

anonymous · Answer

To evaluate expressions and obtain a correct answer a person
must follow the following four steps. 
First evaluate the information in grouping symbols, second, evaluate anything
with an exponent, third, multiply and divide in order from left to right and
finally add and subtract in the same order from left to right.
If these steps are not followed in this order the answer will be
different and therefore incorrect. For
instance if a person first adds numbers before multiplying the answer will be
incorrect.