I dont know if you wanted the steps but:
x^2-4x-6=0
plug it into the equation:

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x^2-4/3x+1/3 x=1 , x= 1/3
2x^2-3x+1=0 x=1 , x=1/2
6x^2+12x=-5
add the 5 to both sides
6x²+12x+5=0 plug the problem into the equation
x=
x=[
x=
x=
x=

Value of x is 140
Tangent are present that means those angles are of 90° and 90° + 90° = 180°
One angle is already given 40°
By angle sum property of Quadrilateral
We can get its value
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Answer:
2) 16
Step-by-step explanation:
180 - 124 = 56
180 - 56 - 60 = 64
64 ÷ 4 = 16
x = 16