Answer:

Step-by-step explanation:
The depth function is:

After 3 minutes, a submarine had descended to −320 feet.
This means that
. So


After 8 minutes, the submarine had descended to −420 feet.
This means that
. So


From the first equation:

So





And

So

Answer: I don’t think u gave enough info
Step-by-step explanation:
Answer:
93
Step-by-step explanation:
So, you basically basic math it, or calculator.