The equation that can be used to determine the dimensions of the base of the doghouse is x² + 4x = 21
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What is the equation?</h3>
A quadratic equation is an equation that usually has a single variable and it is raised to the power of 2.
Area of a rectangle = length x width
x (4 + x) = 21
x² + 4x = 21
To learn more about quadratic equations , please check: brainly.com/question/27696091
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Answer:
You know this because $110x20%=$22.
Simple...
Which line shows the first error in the solution?
Line 3
This said, because...
5x-25=15
It'd be adding not subtracting-->>
5x-25=15-25 (No)
5x-25=15
+25 +25
5x=40 (Yes)
Thus, your answer.