A is a direct variation
B is a partial variation
C is a partial variation
D is a direct variation
It would be at rate of 68 ill use per minute so
68x=1y
Factor
0.0625
0.25 * 0.25
Square root is a 2nd root which is even so there can be negative solutions.
Sqrt(0.0625) = 0.25 or -0.25