How do I find the missing side?

Step-by-step explanation:

as indicated by the red square, it is a right triangle. so you would a2 plus b2=c2. or in this case

11.9^2+b^2=14.7^2

141.61 + b^2 =216.09

b^2=74.48

b≈8.63

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!