https://file.aiquickdraw.com/mathbot/file/1729166052553bhz06st9.jpg

To solve this, we’ll use the formula given in the image:

\[
c = 18n + 13
\]

where:
- \( c \) represents the total cost in pence,
- \( n \) represents the number of units of electricity used.

Since Tom uses 250 units of electricity, we substitute \( n = 250 \) into the formula:

\[
c = 18 \times 250 + 13
\]

Calculating step-by-step:

1. Multiply \( 18 \) by \( 250 \):
   \[
   18 \times 250 = 4500
   \]

2. Add \( 13 \) to the result:
   \[
   4500 + 13 = 4513
   \]

So, Tom's bill is **4513 pence**.

Would you like further details on this calculation or have any questions?

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Here are 5 related questions for further exploration:

1. What would Tom's bill be if he used 300 units of electricity?
2. How much does each unit of electricity cost based on this formula?
3. If Tom's bill was 5000 pence, how many units of electricity did he use?
4. How would the formula change if there was a discount of 5 pence per unit?
5. What is the percentage increase in the bill if Tom uses 100 additional units?

**Tip:** To solve linear equations like this one, substitute the given values and follow the order of operations: first multiply, then add or subtract as needed.

An electricity company uses the formula below to calculate bills. How much is Tom's bill if he uses 250 units of electricity? Give your answer in pence (p).

Learn how to calculate Tom's electricity bill using the linear equation c = 18n + 13. This step-by-step guide demonstrates how to substitute 250 units into the formula to find the total bill in pence, suitable for students in Grades 6-8.

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