The interior angles of a parallelogram will always equal 360. The interior angles of a triangle are 180 if it is a equilateral triangle then the angles are 60 degrees each. You know 2 sides of parallelogram. The 100 degree and 90 degree. You can find the one opposing the x because it’s on a straight line and a straight line is 180 degrees if a triangle is 60 degree angle then the opposing angle to complete the straight line must be 180-60 so you get 120. You now know 3 sides. 120, 90 and 100
They should add up to be 360 so you can set up an equation like so 
120+90+100+x=360
And x = 50
        
                    
             
        
        
        
F^1(x)=2x-16 To find the interverse interchange the variable and solve for y
 
        
        
        
I think, not 100% sure, but I think it is square root (A/4pi)=r
        
                    
             
        
        
        
Yes there’s 44 remainders :)