Answer:
Step-by-step explanation:
it depends. if (for example) y=x2 then there are an infinite amount of answers. if there is an equation like: If (variable X)= (variable Y) + 5 and if X=5, what is Y? then there is only one answer. check an algebra book, it can give you a more detailed answer.
Answer:
The answer is just 1 and 3.
Step-by-step explanation:
To understand this problem, you must think of what whole numbers actually are.
Whole numbers consist of Positive integers and Zero.
Positive integers include 1, 2, 3, 4, 5, 6, ... etc
Zero is 0
The reason 
isn't a whole number is because that fraction doesn't reduce any further and does not yield a whole number.
The answer is 27a^6
Hope this helps.
-2.8, -2.6, -2.3
Hope this helped :)
12/3 = 4 minutes
4 minutes per kilometre
4x7=28
28 minutes
