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Let's go through the questions one by one, based on the equation provided: $ c = 0.15t + 2.50 $, where $ c $ represents the total cost of renting a canoe, $ t $ is the time in minutes, 0.15 is the rate per minute, and 2.50 is the base charge.

### 1. **What do the numbers in the equation tell you?**
   - The number **0.15** represents the cost per minute of renting the canoe. So, for every minute of usage, you pay $0.15.
   - The number **2.50** is a fixed base charge, meaning you pay $2.50 just to rent the canoe, even if you don't use it for any time at all.
   
   In summary, the equation shows that the total cost is made up of a base charge of $2.50 plus an additional $0.15 per minute of usage.

### 2. **How much does it cost to rent a canoe for 25 minutes?**
   Using the equation $ c = 0.15t + 2.50 $, substitute $ t = 25 $ minutes:
   \[
   c = 0.15(25) + 2.50 = 3.75 + 2.50 = 6.25
   \]
   So, it costs **$6.25** to rent a canoe for 25 minutes.

### 3. **A customer is charged $9.25. How long did they use the canoe?**
   Using the equation $ c = 0.15t + 2.50 $ and knowing $ c = 9.25 $, solve for $ t $:
   \[
   9.25 = 0.15t + 2.50
   \]
   Subtract 2.50 from both sides:
   \[
   6.75 = 0.15t
   \]
   Now divide by 0.15:
   \[
   t = \frac{6.75}{0.15} = 45 \text{ minutes}
   \]
   So, the customer used the canoe for **45 minutes**.

### 4. **A customer has $6 to spend. How long can they use a canoe?**
   Using the equation $ c = 0.15t + 2.50 $ and knowing $ c = 6 $, solve for $ t $:
   \[
   6 = 0.15t + 2.50
   \]
   Subtract 2.50 from both sides:
   \[
   3.50 = 0.15t
   \]
   Now divide by 0.15:
   \[
   t = \frac{3.50}{0.15} \approx 23.33 \text{ minutes}
   \]
   So, the customer can use the canoe for about **23 minutes** with $6.

---

Do you want further details or have any questions about this?

### Related Questions:
1. What would be the cost for using the canoe for 1 hour (60 minutes)?
2. If the base charge increased to $3, how would this affect the overall equation?
3. How much would a customer be charged for 15 minutes of usage?
4. How long could a customer use the canoe if they had $12 to spend?
5. If the cost per minute increased to $0.20, how would this affect the time they can use the canoe for $6?

### Tip:
Always double-check your units when working with time and cost equations to avoid errors!

When Rashida and Serena applied for jobs at Sandy’s, the owner gave them the following test questions to see if they could calculate charges correctly.

Learn how to calculate canoe rental costs using the linear equation c = 0.15t + 2.50. This problem includes finding costs for different rental durations and solving for the time given a specific charge. Suitable for Grades 6-8.

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