How do you decide whick of two numbers is greater when both numbers are positive, both numbers ate negative, and one number is positive and one number is negative

How many $20 bills do you need to have to make $280

Shannon drove for 540 minutes. if she traveled 65 miles per hour,how many total miles did she travel?

Oliver had $50 on the day before his birthday. after he recived some money for his birthday , he had $75. write and solve eqaution to find how much money oliver received for his birthday. x+50=75