This is pretty much a "common sense" question. It'd be best to get rid of the dirty sanitizing water and start fresh; in other words, he should change (throw out) the dirty water and make a fresh sanitizer.
By the way, this is the Math section; next time, please choose a different section more suited to your questions.
Infinite solutions they are a set of equations that express a set of quantities
It is a term because it’s a number and letter together
This diagram represents a: C: Food Chain. it explains what gets eaten by whom to survive. Hope it helps!!
Consider the expression 
Group first two terms and second two terms:
In first brackets the common factor is 
and in second brackets the common factor is 
Then
Answer: correct choice is A.
