I went in order from top to bottom. don't know if this was what you meant...... (1,2), (2,-2), (3,-6), (4,-10).
Answer:

Step-by-step explanation:
= Surface area of base = 5 square meters
Volume of water in tank = 70 cubic meters
The rate at which the volume is reducing is

Integrating from
to 

Volume of water remaining in the tank is 
Suface area of base
depth = Volume

The depth of the water remaining in the tank is
.
Answer:
i think the answer is 392= 49/Q