Q: Solve problems using the order of operations?

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Addition and subtraction are inverse operations. So you can solve addition by subtracting.

If you change the order of operations, you will get a different result. The person who wrote the expression had a specific order of operations in mind (using generally-accepted rules), so arbitrarily using some other order of operations is, quite simply, wrong.

Use a variable to represent the unknown. 'Translate' the words to math symbols and write an equation to solve. Solve the equation. Check.

Matrices are tools to solve linear equations. Engineers use matrices in solving electrical problems in circuits using Thevenin's and Norton's theories.

Replace the variables with the correct values and calculate using the order of operations

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Addition and subtraction are inverse operations. So you can solve addition by subtracting.

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(4+3)3 → Using order of operations, solve the bracket first. (7)3 → Multiply 21

There is no single method. There are different methods for different problems.

If you change the order of operations, you will get a different result. The person who wrote the expression had a specific order of operations in mind (using generally-accepted rules), so arbitrarily using some other order of operations is, quite simply, wrong.

Follow the rule about the order or operations!

Follow the rule about the order or operations!