Rhonda sells textbooks her paycheck is found using the formula p=30b+15, where is the number of textbooks she sells. solve the formula for b

When george started his current job, his employer told him that at the end of the first year, he would receive two vacation days. after each year worked, his number of vacation days will double up to five work weeks (25days) of payed vacation. how many vacation days will he have in 4 years