Answer:
x = 80
Step-by-step explanation:
the total of interior angles in a quadrilateral (any shape with only 4 sides) is 360
add the angles you're given
105 + 100 + 75 = 280
subtract that number from the total interior angles (360)
360 - 280 = 80
therefore, x = 80
hope this helps! have a lovely day!!
