Answer:
1 option is correct
Step-by-step explanation:
Angle AOB and DOC is vertically opposite angle
Solutions
⇒15 Cookie to 40 brownies can be written as 15:40
⇒15:40 is the ratio we have to simplify
The GCF of 15 and 40 is 5 so we divide them by 5
15 ÷ 5 = 3
40 ÷ 5 = 8
3:8 is in simplest form
54 as opposite angles are the same and they need to have the same angle to be parallel
As we can see that common difference is increasing to one more digit after every term
so it means
a21 = 231
