1) flying against a head wind, a plane could fly 3000 km in 6 hr. the plane would require only 5 hours for the return trip with no change in wind. find the wind speed and air speed of the plane?

rate=distance/time

Could someone with number 1 and 2

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

Use sigma notation to represent the following series for 9 terms.