https://file.aiquickdraw.com/mathbot/file/1727857313935lukru40w.jpg

The problem provides the formula for the monthly cost of a landline subscription:

\[
P = 40 + t \cdot 3
\]

where:
- \( P \) is the total price in kroner (DKK),
- \( t \) is the monthly talk time in hours.

You are asked to find \( P \) for April when the phone is used for 20 hours.

### Solution:
Substitute \( t = 20 \) into the equation:

\[
P = 40 + 20 \cdot 3 = 40 + 60 = 100
\]

Thus, the total price \( P \) is **100 kroner**.

The correct answer is **P = 100 kr**.

Would you like further details or explanations on this? Here are five related questions to deepen your understanding:

1. How does changing the talk time \( t \) affect the total cost \( P \)?
2. What would \( P \) be if the phone were used for 30 hours in a month?
3. How would the formula change if the cost per hour were 4 kroner instead of 3?
4. What is the base cost of the subscription when no calls are made?
5. How could this formula be represented graphically?

**Tip**: Always substitute carefully into formulas and double-check your arithmetic when solving algebraic equations.

What is the monthly cost of a landline subscription in April when the phone is used for 20 hours? The formula is P = 40 + t * 3, where t is the number of hours of phone usage.

Learn how to calculate the monthly cost of a landline subscription using a linear equation. Solve for the total cost when the phone is used for 20 hours with the formula P = 40 + t * 3. Ideal for students in Grades 6-8.

Math Problem Statement

Solution

Ask a new question for Free

By Image

Math Problem Analysis

Mathematical Concepts

Formulas

Theorems

Suitable Grade Level

Related Recommendation