Exercise 1 Page 98

The expected attendance at a school event is 65 people. We are told that the actual attendance x can vary by up to 30 people. This means that the actual attendance can be 30 people more than expected, or 30 people less than expected. x=65+30 or x=65-30 We can subtract 65 in both sides of these equations in order to write them as an absolute value equation. x-65=30 or x-65 =-30 ⇓ |x-65|=30 Therefore, the answer is A.