1.

The temperature at the foot of a mountain is\[\text{+5  }\!\!{}^\circ\!\!\text{ C}\]. It fell down by \[\text{10  }\!\!{}^\circ\!\!\text{ C}\] on the top of the mountain. What is the temperature recorded on the top?

A. \[\text{+15 }\!\!{}^\circ\!\!\text{ C}\]  
B. \[\text{-15 }\!\!{}^\circ\!\!\text{ C}\]
C. \[\text{+5  }\!\!{}^\circ\!\!\text{ C}\]   
D. \[\text{-5  }\!\!{}^\circ\!\!\text{ C}\]  
Answer» E.


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