I think it’s b the water is 2.2 meters below the ground floor. Sorry if I’m wrong.
Answer:
y=50x
Step-by-step explanation:
distance = 50 times the laps
100= 50 x 2
200 = 50 x 4
250= 50 x 5
400 = 50 x 8
Answer:

or 
Step-by-step explanation:
Given

Using Completing the Square
---- Add
to both sides


Divide the coefficient of x by 2; then add the square to both sides



Factorize




Hence, the equation is 
Solving further
Take square root of both sides



This implies that
or 
or 
HEnce, the solutions are
or 