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shelby had \$18.50. She spent \$7.25 at the car wash. Write an expression that shows how much she spent.

You have just said that she spent \$7.25. There is no need for an equation.

However, if you want to know how much she has left:

\$18.50 - \$7.25 = ?

I hope this helps. Thanks for asking.

(18.50 -7.50)

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