Find the value of the missing variable

Is it true or false i’m trying to pass this test so i can leave school

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! : )

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?