Final answer:
To answer the student's question about the volume of cement for a porch, we would substitute x = 2 into the polynomial expression given.
Step-by-step explanation:
The student's question involves calculating the volume of cement needed for a porch, represented by the polynomial expression x(2x²+15)(4x²+5x+3), where x is given as 2 inches. We are to find the volume by substituting the value of x into the polynomial. However, the provided information related to other topics such as scale models and dimensions, and equilibrium equations in chemistry, do not directly pertain to the student's question regarding the volume of cement required for a porch, which is a Mathematics question. To solve the student's original question, we would calculate the polynomial expression using x = 2.