C. Obtuse hope this helps (lmk if you get it right)
using order of operations (PEMDAS) your answer should be 46
you do multiplication before addition.
I think it would be 5,720, because if you figure every year the population grows 260, then 2600x2 would be doubled then add the 2 years missing so add 260+260. It would equal 5,720.
Exacty two sides are congruent so its an Isosceles triangle