Equation used to solve for the unknown positive integer is 
So, Option C is correct.
Step-by-step explanation:
We need to write the equation from the statement given:
<em>Twenty times a square of a positive integer, plus 50 equals negative 40 times the square of the positive integer, plus one-hundred and ten times the positive integer.</em>
Let the number is x
Now, the equation will be:

Simplifying the equation we get:

Equation used to solve for the unknown positive integer is 
So, Option C is correct.
Keywords: Algebraic Expression
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