## Algebra 1: Common Core (15th Edition)

a. Because $\sqrt 9$ is 3 and it belongs to natural number . b. $\frac{3}{10}$ = 0.3(3) which the decimals follow a pattern therefore it is rational number . c. The decimal does not follow any patterm therefore it belongs to rational number group. d. The result of $\sqrt 12$ does not follow any pattern but never ends --> It is irrational number.