What’s the difference between a linear and nonlinear function

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers

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