The answer would be
y=(x+4)^2−19
-0.5 n^2=-18
n^2= 36
n= sqrt (36)=6 or -6
Hope this can help.
Answer:
12.8km/hr
Step-by-step explanation:
Distance = 76.8km
Time = 6 hours
Speed = distance ➗ time
Speed = 76.8km ➗ 6 hours
Speed = 12.8km/hr
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