# The position vector of A has the Cartesian coordinates (20,30,50). The position vector of B has the Cartesian coordinates (10,40,90). What are the coordinates of the position vector of A+B?

$< 30 , 70 , 140 >$
$A + B = < 20 , 30 , 50 > + < 10 , 40 , 90 >$
$= < 20 + 10 , 30 + 40 , 50 + 90 > = < 30 , 70 , 140 >$