What is the length of side b?

Thank u

My guess is length of side B would be 12. This is my estimation, I remember a bit on how to do these but since it’s a triangle, I’m thinking the sides are going to be 1/2 of the base. In this case, the base is 24, so the sides should be 12.

20000 as first it increases by 2500 then by 5000 so next it will increase by 10000