Respuesta :

Your aanswer is 13.9 because the 13 stays the same and in decimals .1 is a tenth so there for .9 is your tenth 13.9

Answer:

Therefore, 13.9

Step-by-step explanation:

Given  :  Thirteen and nine tenths.

To find : Write in standard form .

Solution : We have given thirteen and nine tenths.

Thirteen = 13

Nine tenths = [tex]\frac{9}{10}[/tex].

13 + [tex]\frac{9}{10}[/tex].

13 + 0.9

13.9

Therefore, 13.9