X=1
3+4=7
3x1=3
3+4 =6 so X =1
Answer:
The value of x is 
Step-by-step explanation:
we know that
Applying the tangent-secant theorem

substitute the values and solve for x



using a graphing tool
to solve the quadratic equation
The solution is 
see the attached figure
The answer is -6 < x < 9.
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Based on the calculations, the value of x in this rhombus is equal to: B. 55.
<h3>How to determine the value of x?</h3>
Since the opposite angles in a rhombus are always congruent, the sum of each angle in any rhombus must be equal to 360 degrees.
From the image of the rhombus, we can deduce the following parameters:
Adjacent angles = 2x + 20 and 50 degrees.
Opposite angles = 2x + 20 and 50 degrees.
Adding the angles, we have:
2x + 20 + 2x + 20 + 50 + 50 = 360
4x + 140 = 360
4x = 360 - 140
4x = 220
x = 220/4
x = 55°
Read more on rhombus here: brainly.com/question/11586845
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A. Octagon Explanation: Hence,a regular polygon that has minimum rotation of 45 degrees to carry the polygon onto itself is A.octagon