I think the answer is 8 miles
Answer:
C. 
Step-by-step explanation:
You are given the exponential function 
From the table,
at
thus
![N(0)=a\cdot b^0\\ \\150=a\cdot 1\ [\text{ because }b^0=1]](https://tex.z-dn.net/?f=N%280%29%3Da%5Ccdot%20b%5E0%5C%5C%20%5C%5C150%3Da%5Ccdot%201%5C%20%5B%5Ctext%7B%20because%20%7Db%5E0%3D1%5D)
Also
at
thus

Since
substitute it into the second equation

and the expression for the exponential function is

Answer:
-700 feet, aka 700 feet below/away from the original cruising altitude
The least common multiple is 32