Respuesta :

[tex] \sqrt{18} = \sqrt{2*3*3} = 3 \sqrt{2} = 3 * 1.41421356237 [/tex]

= 4.24264068712 ≈ 4.2

You can draw a number line making 5 divisions in between the whole numbers (4 and 5) and hence you can show 4.2