Question 12605
Let Angle A be your X,
So Angle B = (1/2)X - 8
Angle C = X + 28

<P>
Since we know the three angles in a triangle add up to 180,

{{{ X + (1/2)X - 8 + X + 28 = 180 }}} Combine Like Terms
{{{ (5/2)X + 20 = 180 }}} Subtract 20 from both sides
{{{ (5/2)X = 160 }}} Multiply by ( 2/5 )
{{{ X = 64 }}}

<P>
So Angle A = 64
Angle B = .5(64) - 8 = 32 - 8 = 24
Angle C = 64 + 28 = 92
<P>
92 + 24 + 64 = 180