Answer:
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Step-by-step explanation:
Given

Required
Determine 
We know that:

This gives:


Collect like terms


Take square roots


By tan identity


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The answers are boxed the rest of it is just the work in case you want to know how to do it.
Answer:
x=5.4
Step-by-step explanation:
x/3+5=6.8
-5 -5
__________
x/3= 1.8
*3
________
x= 5.4
Answer:
It is integer and rational .....
Step-by-step explanation:
Hope it helps