Question

Susan is purchasing a cell phone plan. The flat cost of the plan is $40 per month, and there is an additional fee of $15 per phone line. Fill in the table showing the monthly cost of the phone plan based on the number of phone lines? (2 points)
Number of Phones Total Monthly Cost
0 $
1 $
2 $
3 $


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Answer 1

To calculate the total monthly cost of the phone plan based on the number of phone lines, we can use the formula:

\[
\text{Total Monthly Cost} = \text{Flat Cost} + (\text{Number of Lines} \times \text{Cost Per Line})
\]

Given:
- Flat Cost = $40
- Cost Per Line = $15

Now, let's calculate the total monthly cost for each number of phone lines:

1. **For 0 phone lines**:
\[
\text{Total Monthly Cost} = 40 + (0 \times 15) = 40 + 0 = 40
\]

2. **For 1 phone line**:
\[
\text{Total Monthly Cost} = 40 + (1 \times 15) = 40 + 15 = 55
\]

3. **For 2 phone lines**:
\[
\text{Total Monthly Cost} = 40 + (2 \times 15) = 40 + 30 = 70
\]

4. **For 3 phone lines**:
\[
\text{Total Monthly Cost} = 40 + (3 \times 15) = 40 + 45 = 85
\]

Now, let's fill in the table:

| Number of Phones | Total Monthly Cost |
|------------------|--------------------|
| 0 | $40 |
| 1 | $55 |
| 2 | $70 |
| 3 | $85 |