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I believe
maybe im wrong so you might wanna check with someone else
I believe the answer is the last one. I hope this helps love! :)
The answer is 10 units. This is because you have to find X where 2x+10 just the same with the other side of the triangle.the triangle is also known as isosceles triangle in which two sides are equal to each other. You just have to equate it to the x+3. So 4x+30=2x+10 so x=10 units.