Final answer:
The sum 45+y^2x is given by the expression 45+y^2x. No specific answer choice can be determined without further information.
Step-by-step explanation:
To find the sum 45+y^2x, we can combine the terms by adding them together. The sum is given by the expression 45+y^2x.
No options are provided in the question, so we cannot determine the specific answer choice from the given information.
However, we can simplify the expression by combining like terms, if any exist.