Two-Step Equations in Real-World Problems

Charlie Kasov, a math teacher, explains how two-step equations can represent real-world problems using a phone company's billing plan as an example. He describes a scenario where the first 10 minutes of a call cost one dollar, and each additional minute costs 50 cents. By setting up and solving a two-step equation, he demonstrates how to calculate the total cost of a 20-minute call, illustrating the practical application of algebra in everyday situations.

Who is the speaker in the video?

• Alice Johnson

• Charlie Kasov

• John Doe

• Jane Smith

What is the main topic discussed in the video?

• History of mathematics

• Two-step equations in real-world problems

• Geometry in real life

• Basic arithmetic operations

What is the cost of the first 10 minutes of a phone call according to the billing plan?

• $0.50

• $1.00

• $1.50

• $2.00

How much does each additional minute cost after the first 10 minutes?

• $0.25

• $1.00

• $0.50

• $0.75

What is the total duration of the phone call used in the example?

• 20 minutes

• 25 minutes

• 15 minutes

• 10 minutes

What is the first step in establishing the equation for the phone call cost?

• Calculate the cost of additional minutes

• Determine the total call duration

• Add the cost of the first 10 minutes

• Subtract the first 10 minutes from the total duration

How do you calculate the cost of the additional minutes?

• Multiply the additional minutes by $1

• Multiply the additional minutes by $0.50

• Add $0.50 to the total cost

• Subtract $1 from the total cost

What is the result of multiplying 10 by 0.5 in the equation?

• 5

• 6

• 4

• 3

What is the total cost of the 20-minute phone call?

• $4

• $5

• $7

• $6

What mathematical concept is used to solve the phone call cost problem?

• Statistics

• Calculus

• Algebra

• Geometry