because she knows the answer and I don't

They tell you what operations to do first. You work from the innermost to the outermost.

For example, 10-(7-3) is 10-4=6 because we have to take 3 from 7 first, making 4, then we subtract the result from 10. Parentheses or the P in PEMDAS which tells you the order you give to various operations in a sum. Brackets are the same as parentheses and you can use the acronym BODMAS like PEMDAS.

- All categories
- Pre-Algebra Answers 12.3k
- Algebra 1 Answers 25.3k
- Algebra 2 Answers 10.5k
- Geometry Answers 5.2k
- Trigonometry Answers 2.6k
- Calculus Answers 6.1k
- Statistics Answers 3k
- Word Problem Answers 10.2k
- Other Math Topics 6.7k

81,963 questions

86,359 answers

2,239 comments

71,753 users