Chapter 3 - Solving Inequalities - 3-2 Solving Inequalities Using Addition or Subtraction - Practice and Problem-Solving Exercises - Page 174: 16

$12\leq f$

$8\leq f-4$ : add 4 to both sides $8+4\leq f-4+4$ : simplify $12\leq f$ Verify that 12 is a solution at the endpoint. $8\overset?= 12-4$ $8=8\checkmark$ Verify that a number greater than 12 is a solution. $8\overset?\leq14-4$ $8\leq10\checkmark$