Carmen runs a business out of her home making bird houses. Each month she has fixed costs of $175. In addition, for each bird house she makes, she incurs an additional cost of $11.50. If her total costs for the month were $520, how many bird houses did she make?

Show your work for each of the following steps:

Step 1. Set up a variable dictionary.

Step 2. Set up an equation.

Step 3. Solve the equation.

Step 4. Answer the question with a sentence.

Step 5. Look back.

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