B your welcome ask another if you need it! Anytime
Answer:
Step-by-step explanation:
28/3
9.333333333333333
we have
------> equation 
------> equation 
Multiply by
the equation 
------> equation 
Sum equation
and equation 

Substitute the value of x in the equation 

therefore
the answer is the option B

Answer:
5/6
Step-by-step explanation:
1/2 + 1/3 need a common denominator to add them up.
1/2 is the same as 3/6.
1/3 is the sane as 2/6.
3/6 + 2/6
Add the tops, but keep the same denominator.
3/6 + 2/6 = 5/6
5/6 cannot be simplified, so that's the answer. That's how you do it! Hope this helps!
Providing a short wikipedia definition here: "In mathematics, a rational number is any number that can be expressed as the quotient or fraction"
So any fraction would work for this question I believe?