Question

CALCULE O DECIMO TERMO DA P.A(3,7,1
1,...)

Answer 1

Sabemos que:

a_n = a_1 + (n-1)*r

razão = r = a_2 - a_1 = 7-3 = 4
1° termo = a_1 = 3

a_10 = 3 + (10-1)*4

a_10 = 3 + 9*4

a_10 = 3 + 36

a_10 = 39