Respuesta :

S1307

Answer:

3.09

Step-by-step explanation:

21 - 17.91=3.09

This means that the difference between 17.91 and 21 is 3.09 which means for 17.91 to be equal to 21 you must add 3.09

The answer is 3.09 since you can subtract 17.91 from 21 which is 3.09