Question

Calcule o 15 termo da P.A (2,7,12,17...)

Answer 1

a15 = ?      a1 = 2          r = 7 - 2 = 5

a15 = a1 + 14 r
a15 = 2 + 14.5
a15 = 2 + 70
a15 = 72        

PA( 2, 7, 12, 17, 22, 27, 32, 37, 42, 47,  52, 57, 62, 67, 72)