A) The temperature is -2 ∘C . If the temperature rises by 15 ∘C , what is the new temperature? B) At midnight the temperature is -6 ∘C . At midday the temperature is 9 ∘C . By how much did the temperature rise?

For A it's 13 degrees C. For B it is 15 degrees.

Step-by-step explanation:

Adding positive numbers to a negative number can be put like this:

ex--- -5+9. You have -5 and +9. What you do is flip it around. +9-5 is 4. So. -2+15=+15-2=13.

For B:

from 6 to 0 is 6, and from 0 to 9 is 9. 6+9=15. There's your answers.

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