1. What part of the situation in Part 1 should be represented by a variable? How do you know?

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   The number of weeks; this is what Stanley wants to know.
   

2. How can you represent \text{"}\$10​ each week\text{"} using a mathematical expression? Why?

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   10x; if x represents the number of weeks, 10x represents the amount of money he will have saved after x ​weeks.
   

3. What expression represents the total amount of money he will have after x​ weeks?

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   45+10x

4. So, what equation can you write to represent this situation?

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   45+10x=125

5. How many weeks will it take for Stanley to have \$125?

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   8 weeks.

6. Look at the graph in Part 2. What type of equation does it represent?

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   Exponential.

7. Is (0,1) a solution to this equation? How do you know?

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   Yes; it lies on the graph of the equation.
   

8. Name an ordered pair that is not a solution. How can you tell from the graph?

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   Answers vary; any ordered pair that does not fall on the curve is not a solution.
   

9. How many solutions does the equation have? How do you know?

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   Infinitely many; there are infinitely many points on the graph.

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