Parenthesis are something you can use in math problems that mean anything inside of them is what you have to solve first. In PEMDAS P is parenthesis which means that is first.
12.6 because it has to be the same as ED
Simon ran slower than 1 mile every 5 minutes.
Because 33 / 5.5 = 6. So he ran 1 mile every 6 minutes, not 5.