Answer:
84
(Note: You put this question in the "History" section so not a lot of people will answer since it doesn't seem to have anything to do with history. Next time put it in "Math" so people will be able to be more help. Its kind of confusing when there is a question in the wrong section.)
Step-by-step explanation:
First, substitute the variables out using the given numbers...
x = 6, y=8, z=6 so..
6(6+8)
Secondly, we have to solve this.
6+8 = 14
6(14) = 84
So your answer is
84
Hope this helps :)