Question

converta os numeros para a base decimal
(3421)5=( )10

Answer 1

$5^0\cdot1+5^1\cdot2+5^2\cdot4+5^3\cdot3=1\cdot1+5\cdot2+25\cdot4+125\cdot3=$ $1+10+100+375=486$

$3421_5=486_{10}$