2025-2026 Geometry-Performance Task-2024-2025-FJUHSD

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6 questions

Candles A and B are lit at the same time. What will be the height, in cm, of each candle after 3 hours of burning?

Candle Type A_______ 
Candle Type B _______ 

Candles A and B are lit at the same time. What will be the height, in cm, of each candle after 3 hours of burning?

Candle Type A_______ 
Candle Type B _______ 

Candles of each type were lit at the same time. Abbie thinks that since Candle Type A burns more quickly than Candle Type B, that it will burn out (have a height of 0 cm) first.

Julie thinks that since Candle Type B starts out much shorter than Candle Type A, it will be the candle to burn out first.

Which candle will burn out first? Give a mathematical explanation to convince Abbie and Julie of your solution. Clearly identify the quantities involved.

Abbie has 3 hours left to film. She lights a new Candle Type A and Candle Type B and then starts filming.

In the 3 hours she has left, will Abbie capture the moment when the candles are exactly the same height?

Explain to Abbie how you can determine the answer.

You have decided to use functions to help Abbie think about the candles.

You show her how to represent the height of a candle, h, as a function of time, t, using this equation:

h = k + nt

First, explain to Abbie what k and n represent in order to model the different candles. Be specific in your explanation.

Now, choose either Candle A or Candle B to create an equation that will tell Abbie the height of the candle at t hours after it is lit.

Determine what the numerical values for k and n should be for the candle you chose.

Using these k and n values, write an equation that tells Abbie the height h of the candle, in cm, at t hours after it is lit.

For her next film, Abbie wants candles that will burn for exactly 8 hours. You want to give her a choice by designing two different candles (Type C and Type D). 

Using the equation h = k + nt, determine two different pairs of values for k and n that will meet the requirement to burn down to a height of 0 cm in exactly 8 hours. 

Complete the table to show two possible sets of values for k and n for your new candle designs.

Candle C: k_______     n _______ 
Candle D: k _______    n _______ 

2025-2026 Geometry-Performance Task-2024-2025-FJUHSD

Abbie has 3 hours left to film. She lights a new Candle Type A and Candle Type B and then starts filming. In the 3 hours she has left, will Abbie capture the moment when the candles are exactly the same height? Explain to Abbie how you can determine the answer.

Abbie has 3 hours left to film. She lights a new Candle Type A and Candle Type B and then starts filming. In the 3 hours she has left, will Abbie capture the moment when the candles are exactly the same height? Explain to Abbie how you can determine the answer.

Abbie has 3 hours left to film. She lights a new Candle Type A and Candle Type B and then starts filming.

In the 3 hours she has left, will Abbie capture the moment when the candles are exactly the same height?

Explain to Abbie how you can determine the answer.

Abbie has 3 hours left to film. She lights a new Candle Type A and Candle Type B and then starts filming.

In the 3 hours she has left, will Abbie capture the moment when the candles are exactly the same height?

Explain to Abbie how you can determine the answer.