Final answer:
The total cost for Rose and Jennie's prom dresses is $229. To find this, you simply add the price of each dress together.
Step-by-step explanation:
The student's question involves basic addition in the context of budgeting for prom dresses. Rose's dress costs $130 and Jennie's dress costs $99. To find the total cost for both dresses, we need to add these two amounts together:
Total cost = Cost of Rose's dress + Cost of Jennie's dress
Total cost = $130 + $99
Total cost = $229
Thus, Rose and Jennie will spend a combined total of $229 on their prom dresses.