It would be 1/2 and in decimal form it’d be 0.5
Since the quadrilateral is inscribed inside the circle, where the four vertices are on the circle itself, this means that the opposite angles add to 180 degrees.
Angle I and Angle D are opposite angles. They add to 180 degrees
(angle I) + (angle D) = 180
(45 degrees) + (angle D) = 180
(angle D) + 45 = 180
(angle D) + 45 - 45 = 180 - 45 ... subtract 45 from both sides
angle D = 135
The measure of angle D is 135 degrees
3-(-4) = 3 + 4
so, as an addition problem it is 3 + 4