posted by grace .
if U=i+3j-2k and V=4i-2j-4k are vectors find U.V, 3U+V& (2U+V).(U-2V) (a)6,10,4(b)4143(c)11,4,5(d)5,11,6
not sure what the alleged answers are supposed to mean, but
3U+V = 3+4,9-2,-6-4 = 7i+7j-10k
work the other linear combinations the same way, and for the dot product multiply pairs and add.
What results do you get?