Overnight change

It was 13°C yesterday, but the temperature changed by -18.6° overnight. What is the temperature now?

Correct answer:

t2 =  -5.6 °C

Step-by-step explanation:

t1=13 °C Δ=18.6 °C  t2=t1+Δ=13+(18.6)=5.6°C

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