Final answer:
Without additional information regarding the dimensions and shapes of the cross sections, it is not possible to calculate the combined area of the two cross sections using just the height of 2 inches and x=7.
Step-by-step explanation:
To find the combined area of the two cross sections where one cross section has a height of 2 inches and x=7, we need additional information about the shapes and dimensions of these cross sections. The provided reference information indicates various scenarios involving cross-sectional areas, dimensions, and changes in area due to factors such as temperature change. However, these references do not give us a direct method to calculate the combined area with just the height and the value of x.
For example, if we examine the scenario described where the cross-sectional area of Block A is L x 2L (which is 2L²) and that of Block B is 2L x 2L (which is 4L²), we could apply this to calculate the combined area by adding these areas together if L were known or could be derived from the given height of 2 inches and x=7. However, the question does not provide this information.
In another scenario, the reference mentions a wider part with the area formula A₁ = ar, and a given formula in the format (¹¹) = 7(0.005)² = 7.85×10⁻⁵ m². Unfortunately, this formula is incomplete and does not directly relate to the question asked. Also, the '7' in the equation could potentially be connected to the given x=7, but it is not clear how without further context or information.
Since the cross-sectional area calculation is dependent on the specific dimensions of the shapes involved, and as those dimensions are not provided in the question, it is not possible to answer this question accurately. More information about the shapes and exact dimensions is needed to provide a precise answer.