Answer:
323/7 or about 46.143
Explanation:
We can infer that the measure of B + C is 90 degrees, so 6x + 1 + 8x - 11 must be equal to 90.
6x + 1 + 8x - 11 = 90
14x - 10 = 90
14x = 100
x = 100/14
x = 50/7
Solve for the measure of C by substituting x with 50/7.
50/7 * 8 = 400/7
400/7 - 11 = 323/7
the measure of C is 323/7