Question

qual o VIGÉSIMO TERMO DA PA (4, 10, ...................)

Answer 1

PA = (4, 10, ...)
a1 = 4
n = 20
r = 10 - 4 = 6

$a_n = a_1 + (n - 1)r \\ a_{20} = 4 + (20 - 1)6 \\ a_{20} = 4 + 19*6 \\ a_{20} = 4 + 114 \\ a_{20} = 118$

Abraços.