An airplane's altitude changes - 378 feet over 7 minutes. What was the mean change of altitude in feet per minute?

The mean altitude will be - 54 per minute

Step-by-step explanation:

We are given with altitude change as - 378 feet over 7 minutes

Now

We need feet per minute

So - 378 / 7 will give us the altitude change per minute

-378 / 7 = - 54

Therefore the mean change of altitude in feet per minute is - 54 per minute