Answer:
Explanation:
By the vertical angle theorem, we know that the measures of angles C and D are equivalent. From this, we can create an equation and then solve for the value of x. So we create: x-2 = -3x+58, which simplifies to 4x = 60. Now we divide both sides by 4, to get x = 15. We can substitute this value into x-2 to get the angle measure of D. So we get (15)-2 = m∠D and this simplifies to 13° = m∠D.