What should be added to the sum of 3pq + 5p2q2+ p3 and p3− pq to get 3p3 − 2p2q2 + 4pq? I’ll mark u as brainlist if u gimme the right answer

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