Answer:
the common difference is plus 3
plane 1 travels 395 miles in 1 hour
plane 2 travels 422 miles in 1 hour
together, they travel (395+422) 817 miles in 1 hour
to have 2451 miles between then, they'd need to travel

so in 3 hours, they'll be 2451 miles apart
Answer:
A?? because I think it's not linear because it's not proportional
Answer:
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Step-by-step explanation: