Answer:
x is the variable
Step-by-step explanation:
Given the following equation:
[tex]\frac{300+200}{x}[/tex]
The term variable is basically a symbol or a letter that will change throughout the completion of a equation. In this case we are solving for x which means x is the letter/symbol that will change throughout the completion of this equation which means "the letter x is the variable."
Hope this helps.