Question

calcule o décimo termo da P.A (6, 14, 22...)

Answer 1

a10 = 6 + (10 - 1).8
a10 = 6 + 72
a10 = 78

Answer 2

$a_{n} = a_{1} + (n-1) \times r$
$a_{10} = 6 + (10-1) \times 8$
$a_{10} = 6 + 72$
$a_{10} = 78$