Answer:
x = 22, ∠B = 122
Explanation:
From the inscribed angle formula, we know that arc ADC = 10x +4 and arc ABC = 68 * 2 = 136. We also know that sum of all angles on a circle is 360, so arc ADC + arc ABC = 360. We can plug in the values into that equation to get 10x + 140 = 360. From that, we know 10x = 220, so x = 22. The question asks for ∠B, which is 5x + 2 = 112.