Are these two correct? if not, correct me and tell me how u figured it out.

How many zeros does the function f(x)=4x3-x2+1 have

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

For the inequality |c| < |d| to be true, which of the following must be true?