Understanding Cost and Time in Graphs

The video tutorial covers the identification of dependent and independent variables, calculating costs for a plumber's work hours using a graph, understanding and interpreting the gradient, and explaining the concept of vertical intercept and flagfall charges in taxis.

What is the dependent variable in the context of cost and time?

• Distance

• Speed

• Cost

• Time

How do you determine the cost for a plumber working 4.5 hours using a graph?

• By looking at the vertical axis

• By drawing a line from the time to the cost axis

• By looking at the horizontal axis

• By estimating the midpoint of the graph

If the charge is $250, which axis should you refer to find the number of hours worked?

• None of the above

• Diagonal axis

• Vertical axis

• Horizontal axis

Why is it better to choose points that are further apart when calculating the gradient?

• It is easier to read the graph

• It provides a higher gradient value

• It makes the calculation faster

• It reduces the error in estimation

What does the gradient represent in the context of cost and time?

• The total time

• The cost per hour

• The time per dollar

• The total cost

What is the meaning of the vertical intercept in the context of the plumber's charges?

• The initial charge before any work is done

• The total cost

• The total time worked

• The cost per hour

What is a 'call-out charge'?

• A charge for each mile traveled

• A charge for the initial visit

• A charge for each hour worked

• A charge for each tool used

What historical term is used in taxis for an initial charge?

• Starting fee

• Entry charge

• Flagfall

• Base fare

What does the term 'flagfall' refer to in the context of taxis?

• The distance traveled

• The number of passengers

• The initial charge when a taxi is hired

• The time spent in traffic

Why is the term 'flagfall' used in taxis?

• Because of the flag on the driver's uniform

• Because of the waving motion to stop a taxi

• Because the flag on the meter falls when hired

• Because of the flag on the taxi