Final answer:
The simplified expression is 30.
Step-by-step explanation:
To simplify the expression 5x+3y when x=3 and y=5, you substitute the values of x and y into the expression and perform the calculation.
Substituting x=3 and y=5, we get:
5(3) + 3(5) = 15 + 15 = 30
Therefore, the simplified expression is 30.
The simplified result of the expression with the given values is 30. Therefore, the correct answer from the options provided is none (A) 45, (B) 60, (C) 75, (D) 90.