Step-by-step explanation:

Answer:
the initial height of water.
Step-by-step explanation:
when time equals zero, no water has been drained.
the volume of the tank is unknown however the volume in the tank is 12 at time zero
You didn’t even show the picture?
Answer:
x= -6
Step-by-step explanation:
Isolate the variable by dividing each side by factors that don't contain the variable