Which of the following must be true?
A If |y| = 25 then y = 25 and y = -25
B If |t| = 40 then t = -40 only
C If |c| = 75 then c = 75 only
D If |u| = -40 then u = -40 and u = 40
The answer is C, when numbers or variables are between "|" (also called bars) it means to remove any negative symbols and think of it as a positive number. If the number is already positive you keep it a positive number.
