Let's apply the law of sine to calculate angle C
sin(81)/26 = sin(C)/28
0.1646 = sin(C)/28 and sin(C) =1.063. Sine sin(α) cannot be > than 1, so this triangle is invalid
You need a picture of the shape.
11.6, if you need a decimal. it's in between 11 and 12
The slope is 300 and the y-intercept is 10,000