Examine the following formal description of sets so that you understand which member they contain.

Write a short informal English description of each set.

a

$)$

$\{$

$4$

$,$

$8$

$,$

$1$

$2$

$,$

$.$

$.$

$.$

$\}$

b

$)$

$\{$

$.$

$.$

$.$

$,$

$-$

$3$

$2$

$,$

$-$

$1$

$6$

$,$

$-$

$8$

$,$

$-$

$4$

$,$

$-$

$2$

$,$

$1$

$,$

$2$

$,$

$4$

$,$

$8$

$,$

$1$

$6$

$,$

$3$

$2$

$,$

$.$

$.$

$.$

$\}$