Respuesta :

Answer:

[tex]3[/tex]

Step-by-step explanation:

[tex]the \: common \: ratio \: is \: 3 \\ i.e \: \frac{21}{7} = \frac{63}{21} = \frac{189}{63} = 3[/tex]

The answer is A

I already wrote the steps and explanation in the image

Sorry for my broken English QAQ

Ver imagen AerisLee