Change in temperature

The morning temperature at the top of a mountain was –9°C (minus 9 degrees).

In the afternoon, the temperature was 4°C.

What was the change in temperature from the morning to the afternoon?

Correct answer:

Δ =  13 °C

Step-by-step explanation:

t1=9 °C t2=4 °C  Δ=t2t1=4(9)=13°C

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