Answer :
Final answer:
After one minute of skating down the mountain, Dawn's altitude changes by -900 feet.
Explanation:
The question mentions that Dawn's altitude is changing by -15 feet per second. This means she is losing 15 feet of altitude every second. To calculate the total change in altitude after a minute, you need to multiply the rate of change (-15 feet) by the total time (60 seconds).
So, the calculation is -15 feet/second x 60 seconds = -900 feet.
This means Dawn's altitude decreases by 900 feet after one minute of skating down the mountain. Therefore, the correct answer is A) -900 feet.
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