[63, 9] [14, 5] [21, 3] [26, ?]

What is the unknown in this pattern, show working please.

Look :

6 + 3 = 9 ===》 [ 63 , 9 ]

1 + 4 = 5 ===》 [ 14 , 5 ]

2 + 1 = 3 ===》 [ 21 , 3 ]

2 + 6 = 8 ===》 [ 26 , 8 ]

it's both, now can you answer my most recent question?

she would want to sell 10 full-year subscriptions and at least 9 half-year subscriptions to get a total of at least $300. 

i hope this answer you! if you have any further questions or concerns, feel free to ask! : )

step-by-step explanation:

mark brainliest!