Answer:
21
Step-by-step explanation:
Hey you can use Mathaway it's really it will solve anything you want
It's B, remember when you have _ ( referring to =) you have straight line, but when it's just < or > you have dotted line
To answer this question, you can use a factor tree, or the table thing (I forgot what it’s called.)
You divide the number by one of its PRIME factors, until there is only one left. The numbers you divided it by are written as shown.
Hope this helps. :)