Michael E. answered • 05/17/18

College and High School Math for Classes and Test Prep

Hello Alex,

Assuming no parentheses in the original problem, we have

21 - 14 / 7 + 11 -4

Division comes before addition and subtraction, so let's do 14 / 7 =2 first, yielding:

21 - 2 + 11 - 4

Even though it is written PEMDAS, which would seem to imply addition comes before subtraction,

you actually do whichever comes first, from left to right.

So, we get the following

19 + 11 -4

= 30 - 4

= 26.

Hope the above helps, and thank you for posting the question.

Michael Ehlers

Alexander B.

05/17/18