Answer:
1.39393939
Step-by-step explanation:

this is because when you add

and

you get

which you'd then divide like this

If you wanted to simplify that it would be
Whats the graph ??
i need it to find the answer
Answer:rate of the plane in calm air = 380 mph
rate of the wind = 100 mph?
Step-by-step explanation:all you have to do is divide 1520 mi by 4 hrs because distance/time. You will get the speed of the plane in calm air this way. The rate of the wind is most likley wrong though, please correct me.