Answer:

For this case we know that
represent the radius,
the height and the rate given is:


And replacing we got:

And that represent 
Step-by-step explanation:
For a tank similar to a cylinder the volume is given by:

For this case we know that
represent the radius,
the height and the rate given is:

For this case we want to find the rate of change of the water level when h =6m so then we can derivate the formula for the volume and we got:

And solving for
we got:

We need to convert the rate given into m^3/min and we got:

And replacing we got:

And that represent 
Ok, so remember the exponentioal law that says

so

answe ris x^6
Answer:
Yes
Yes
No
No
Step-by-step explanation:
Three times as long of 20 square meters would be 60
you can do 20×3 to get 60.