Answer:
-20
Step-by-step explanation:
5a - 2b a=-2 b=5
5(-2)-2(5)
-10-10=-20
The 4th option would be correct.
{X | - Root 5 < x < Root 5 }
So I am assuming that there is a 20% off sale on an item that is 20$.
Edit: I read the question wrong, the 2nd thing I wrote down is the correct answer, it will be $24 after the markup.