Answer:
A
Step-by-step explanation:
A
<h3>
Answer: 0</h3>
The discriminant is the number under the square root of the quadratic formula

The discriminant formula is 
If D = 0, then the whole square root portion is 0 meaning we end up with the solution 
Answer:
$511
Step-by-step explanation:
If each liter costs $73$, then 7 liters is 7 times 73, which is $511.
Would the common factor be 1?
edit
the least common is 1 and the most common is 2
thanks andreadiaz2003