9+(-8)=

-2-(-8)=

(-3)+22=

62-(-8)=

9-(-7)=

(-5)+(-27)=

3+(-9)=

-99+99=

-15-(10)=

Mrs. Holt wants to buy a toy for $49. She has a coupon for 10 dollars off. Use the expression 49 + (-10) to find how much money she spent on the toy.

Christian runs down a hill 30 feet. Gavin runs 17 feet further down the hill than Christian. Use the expression (-30) + (-17) to find out Gavin's location on the hill.

It was 78 degrees in Grand Forks yesterday. The temperature dropped 12 degrees overnight. Using this information what would the temperature in Grand Forks be today?