How can you use factoring to solve these three problems?

What is the average rate of change for this function for the interval from x=2 to x=4 ?

Can someone me and plz do the problem

Jacob signs up to work for 2 1/2 hours at the school carnival. if each work shift is 3/4 hour, how many shifts will jacob work? (i just want to double check : |, for anybody that responds! : )