Final answer:
To calculate Donovan's weekly breakfast expense for granola bars and orange juice, multiply the daily cost (2B for bars plus J for juice) by 7, resulting in the expression 7(2B+J).
Step-by-step explanation:
The question pertains to calculating the price Donovan spends on his breakfast consisting of granola bars and orange juice over the course of a week. More specifically, if a granola bar costs B dollars and a glass of orange juice costs J dollars, the expression to compute the weekly expense is 7(2B+J). This accounts for Donovan eating 2 granola bars and drinking 1 glass of orange juice each day of the week.
In this situation, Donovan's daily breakfast cost would be 2B (two granola bars at B dollars each) plus J (one glass of orange juice at J dollars). To understand his weekly expense, we multiply the daily cost by 7, since there are 7 days in a week. Therefore, the expression 7(2B+J) accurately calculates Donovan's total weekly breakfast expenses.