Find the value of angle n

The weight of an object in a particular scale is 175.2 lbs. the measured weight may vary from the actual weight by at most 0.1 lbs. what is the range of actual weights of the object

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have