# Evaluating algebraic expressions

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##### Intros

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##### Examples

###### Lessons

- Below we have used ponds and tadpoles to model an expression. Write the expression and use the variable x to represent the unknown number of tadpoles in each pond.
- Mary bought $s$ packages of stickers, and there are 10 stickers in each package. Write an expression to show how many stickers Mary bought.
- Write an expression for each phrase. Then, evaluate the expression.
- Evaluate the following expression, if $x = 7$ and $y = 9$