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4-73.

Solve the following absolute value inequalities.

$| x - 4 | < 9$
Hint (a):
See problem 4-66 for additional examples.
Answer (a):
$−5<x<13$

$| \frac { 1 } { 2 } x - 45 | \geq 80$
Hint (b):
See part (a).
Answer (b):
$x\ge250\ \text{or}\ x\le−70$

$| 2 x - 5 | \leq 2$
Hint (c):
See part (a).

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