Chapter 1 - 1.7 - Linear Inequalities in One Variable - 1.7 Exercises - Page 138: 85

$|P-7.50|\leq0.25$

$|u|\lt a~↔~-a\lt u\lt a$ $|u|\leq a~↔~-a\leq u\leq a$ $|u|\gt a~↔~u\lt-a~or~u\gt a$ $|u|\geq a~↔~u\leq-a~or~u\geq a$ $7.25\leq P\leq7.75$ $7.25-7.50\leq P-7.50\leq7.75-7.50$ $-0.25\leq P-7.50\leq0.25$ $|P-7.50|\leq0.25$