Answer:

Step-by-step explanation:
(This exercise is presented in Spanish and for that reason explanation will be held in such language)
El lado restante se determina por la Ley del Coseno:



Finalmente, el angulo C se halla por medio de la misma ley:




The way we simplify this is by using the distributive property and multiply every term by 0.5. When we do this we get 2a+3b
I got the answer 18.79
I believe this is correct, Please tell me if im wrong. :)
The answer is 25, 33. The difference between each consecutive number is 8.