There should be a typo in the question: the correct formula would be
Let's compute first. We have
If we intersect this set with X, we have
So, that would be the left hand side. For the right hand side, we have
And their union is again
Is there a triangle whose angles have these measures in degrees? A) Yes B) No
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we are given
Firstly , we will multiply both sides by 5
now, we can simplify it
now, we can solve for n
.............Answer