I need help? i don’t understand this ?

Pls never taught i’m really confused and i rlly need

Factor the gcf out of the polynomial 9x^6+6x^4+15x^3

The ages of personnel in the accounting department of a large company are normally distributed with a standard deviation of 7 years. there is a 0.02275 probability that the age of any randomly chosen person in the department is less than 22 and 0.15866 probabilty that the age of any randomly chosen person is greater than 43. what is the mean of this distribution?