Ross is studying the rate of change in the velocity of a remote controlled car. He notices that the velocity of the car is increasing at a constant rate. Which graph shows the fastest rate of change in the velocity of Ross' car?

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