Final answer:
The correct expression for the given question is '3x + 0.05sin(y^3) = 5', which corresponds to Option B, indicating the mathematical operation of adding 5% of sin(y cubed) to 3x.
Step-by-step explanation:
The correct expression for the equation 'She had + 5% sinx, y03 = 5' is one that accurately reflects the mathematical operations and notations involving percentages and trigonometric functions. In the given options, '5%' would need to be converted to a decimal, which would be 0.05. Additionally, the context appears to be dealing with a sine function of y cubed, sin(y^3), rather than sin(x) or the cube of sin(y). Therefore, the equation should include 0.05 multiplied by the sine of y cubed.
Based on this understanding, the correct expression is Option B: 3x + 0.05sin(y^3) = 5. This equation reflects the correct use of the percentage as a decimal in a mathematical expression involving trigonometric functions.