How many quarters can fill a 1 liter bottle?

Which equation and solution can be used to solve this problem? thirteen less than a number is sixteen. 13-n=16: add 13 to both sides. the answer is 29. n+13=16: subtract 13 from both sides. the answer is 3. n+16=13 subtract 13 from both sides. the answer is 3. n-13=16: add 13 to both sides. the answer is 29.

Two lines parallel to a third line are parallel to each other. always sometimes or never

Polynomial that can be factored as (3x-4)(3x+4)