Final answer:
The algebraic expression for the total miles Brian drove over two weeks is 142 + d, with d representing the miles driven in the latest week.
Step-by-step explanation:
The student is asking to create an algebraic expression that represents the total number of miles driven by Brian over the last two weeks, using the variable d to represent the number of miles driven in the most recent week. Brian drove 142 miles last week, so we can represent the total miles driven over the two weeks with the expression 142 + d. This expression simply adds together the known number of miles from last week with the variable amount from this week.