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**Question**

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16)

The graph below is used to convert between

- temperature in degrees Fahrenheit (
*F*)

and - temperature in degrees Celsius (
*C*).

a) Use the graph to convert 40 degrees Fahrenheit into degrees Celsius.

**[1 mark]**

At one temperature,

*T*,

the number of degrees Celsius is

**double**the number of degrees Fahrenheit.

The graph of

*C*= 2

*F*can be drawn to help find this temperature.

b) On the grid opposite, draw the graph of

*C*= 2

*F*for values of

*F*from –25 to 25

You may use the table to help you.

**[2 marks]**

c) Use your graph to estimate the value of

*T*.

Give your answer in degrees Celsius.

**[2 marks]**