Answer:
x = 55, upper left angle is 135, down left angle is 55
Step-by-step explanation:
The shape is a quadrilateral and all of the quadrilaterals angles added together is 360 degrees and that little square at the bottom right of the shape means it's a right angle and a right angle is 90 degrees so:
4x - 85 + 80 + x + 90 = 360
rearrange to make it easier to add like terms
4x + x - 85 + 80 - 90 = 360
add like terms
5x + 85 = 360
subtract 85 from both sides
5x = 275
divide both sides by 5
x = 55
Plug 55 into 4x - 85 to find the angles
4(55) - 85 = 135
