Respuesta :

carolinejones013

Answer:

12.6

Step-by-step explanation:

If 21 divided by 5 is 4.2, you should multiply 3 by 4.2 you'll then get 12.6. to double check, do 5 divided by 3, which is 1.67, and 21 divided by 12.6 is also 1.67. so side OP is 12.6! :)

helphelp20

Answer:

i don't know sorrryyy

Step-by-step explanation:

im very sorry because im sor busy