Answer:
x = 11
Step-by-step explanation:
x² = 121
You are solving for the variable, x. Note the equal sign, what you do to one side, you do to the other. Isolate the variable, x. Root both sides:
√(x²) = √(121)
x = √121 = √(11 * 11)
x = 11
x = 11 is your answer.
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If you write

, you'll notice this is really just a quadratic equation that can be factorized:

So you have

and
The slope of the line is 4/1 and the y-intercept is -1.
I think it's 10 because the perimeter is 30 and I divided the 30 by 3 because there's 3 rectangles and the answer I got is 10. Not 100% accurate but yea
The answer is actually choice B. To solve for the area of a trapezoid, you would do the formula a+b/2 h.