How do i simply the algebraic fraction and assume all denominators are non​

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?

Factor the following expression completely 6x^11-24x^7

The sum of two numbers is 17 and their different is 5. find one' answers