ANSWER
The correct answer is

EXPLANATION
The number

is a rational number.
Since the set of rational numbers is closed under addition, the number that should be added to

should also be a rational number in order to get another rational number.
This means that, if we add a rational number to an irrational number we get an irrational number.
The only rational number in the options provided is

We add it to

to get

Note that,

Hence the result is a rational number.
As for the remaining options,

are irrational numbers, so adding them to

will not produce a rational number.
Well, let's look at the answer choices.
A) If you want to fond the total cost of two sweaters you would add, not divide. So this isn't it.
B) To find out how much older someone is you would subtract. So this isn't it either.
C) To find out how many desks are needed you would multiply, since you know you need 3 rows of desks with 7 students each (3 x 7). Again, not it.
D) To find out how many pencils each student would get, you'd divide. You would divide 56 by 9. So your answer is D.
Answer:
positive
Step-by-step explanation:
y positive
x positive