Hey there!
All the angles in a triangle add up to 180.
So,
70+30+x=180
100+x=180
x=80
I hope this helps!
~kaikers
The area of the large box is x^2 and the area of the small box is 3^2 which is 9. So the area of the leftover part is x^2-9 or (x-3)(x+3).
Hope that helped.
The correct answer for this would be 1.00 1.25. Hope this is helpful.