Answer:
17
Step-by-step explanation:
the rise is the new minus the old.
9 - -8 = 9+8 = 17
rise in temp= 17℃
midnight= -8℃
noon= 9℃
9- (-8)= 17
or you could just count the difference on your fingers.
-8, -7 ,-6........ 6, 7,8,9
