Final answer:
The question relates to Mathematics, focusing on the Distributive Property, unit conversions, and scientific notation calculations. For high school students, understanding and applying these concepts are important for algebraic manipulation and scientific computations. The correct answer is b. x - 324.
Step-by-step explanation:
The subject of the question is Mathematics, specifically dealing with the Distributive Property, unit conversions, and calculations involving scientific notation.
The grade level is likely High School as it involves algebraic manipulation and scientific notation, which are typically high school level mathematics topics.
One of the simplified expressions provided is 4(80 + 2), which can be simplified using the Distributive Property to get 320 + 8 = 328. For the expression with variables: 4(8d + 2), the Distributive Property would give us 32d + 8.
Furthermore, we also tackle evaluating expressions using scientific notation and discuss multiplying and dividing terms in scientific notation.