Answer: -520
Step-by-step explanation: rather than 540-20 you'll do 20-540 and get -520 plus it's below sea level, so you know it's a negative
Answer:
520 feet.
Step-by-step explanation:
She descended 520 feet because if she started from 540 and ended at 20, we can do 540-20=520 feet.
If you want to simplify, -11-132x
200,000,000
8,000,000
478
all added together