Question

sebbie recorded the temperature hourly. what was the temperature at 9am? °c

Explanation:

Step1: Analyze the graph's time and temperature scale

The x - axis is time (from 8 am to 4 pm) and the y - axis is temperature (in $^\circ$C). At 8 am, the temperature is around 12 $^\circ$C (or we can see the trend between 8 am and 10 am). The time between 8 am and 10 am is 2 hours, and the temperature at 8 am is, let's assume the initial point is 12 $^\circ$C (from the graph's y - axis) and at 10 am it's 16 $^\circ$C (approximate from the graph). But actually, by looking at the graph, the line from 8 am to 10 am: at 8 am, the temperature is 12 $^\circ$C (or we can see the grid lines). Each small grid on the y - axis: from 10 to 15, there are 5 units, so each small grid is 1 $^\circ$C? Wait, no, from 10 to 15 is 5 units, so each unit (small grid) is 1 $^\circ$C. At 8 am, the temperature is 12 $^\circ$C (since it's 2 units above 10). Then, from 8 am to 10 am, the temperature increases. At 9 am, which is the mid - point between 8 am and 10 am, we can calculate the temperature. The temperature at 8 am is 12 $^\circ$C, at 10 am is 16 $^\circ$C. The change in temperature over 2 hours (from 8 am to 10 am) is $16 - 12=4$ $^\circ$C. So per hour, the increase is $\frac{4}{2} = 2$ $^\circ$C. So at 9 am (1 hour after 8 am), the temperature is $12+2 = 14$ $^\circ$C. Alternatively, by directly looking at the graph, the point at 9 am (mid - way between 8 am and 10 am on the x - axis) has a y - value (temperature) of 14 $^\circ$C.

Step2: Confirm the temperature at 9 am

By observing the graph, the line from 8 am (temperature 12 $^\circ$C) to 10 am (temperature 16 $^\circ$C) is a straight line. So at 9 am, the temperature is 14 $^\circ$C.

Answer:

14