Answer:
its B -15 - 10 = -25
Step-by-step explanation:
The speed is the ratio between the distance and the time:

Data:
d=6343miles
t=9h

Then, the plane traveled at a speed of 704.77 miles per hour.
Answer:
2m - 11
Step-by-step explanation:
twice m = 2m
decreased by 11 = -11
240 people could ride it in 3 hours. The rate per hour is 80 people.
8 + 3 (4 - n )
n= 3
8 + 3( 4-3)
8 + 3 * 1
8 + 3 = 11