Respuesta :

Take the average of the first and last terms, and multiply by the number of terms.
A) there are 14 terms.
Average(-3,62)=29.5
14(29.5)=413
B) 10 terms
Average(sqrt(3),18sqrt(3))=9.5sqrt(3)
10*9.5sqrt(3)=95sqrt(3)
RELAXING NOICE
Relax