# How do you find abs(-10 + 11i )?

$| - 10 + 11 i | = \sqrt{221}$
$| a + b i | = \sqrt{{a}^{2} + {b}^{2}}$
Hence, $| - 10 + 11 i | = \sqrt{{\left(- 10\right)}^{2} + {\left(11\right)}^{2}} = \sqrt{100 + 121} = \sqrt{221}$