Answer:
20.7 units
Step-by-step explanation:
The reading is:
-20.7
So, 20.7 units below the water's surface
Your question seems incomplete :-(
Do you mean something like y<21?
Answer:
12
Explanation:
20 words do be annoying
=2025
change 18months to years=1.5 years then you use the formula
PRT÷100