Not sure what dimensions means but this is what I got out of it , hope it helps !
When taking square roots, you can't take square roots of negative roots of negative numbers. So, what will work for the domain of u(x) is what makes u(x) zero or more. We can make an inequality for that.
u(x) ≥ 0.

9x + 27 ≥ 0 by squaring both sides
9x ≥ -27
x ≥ -3
So the domain of the function is when x ≥ -3 is true.
Answer:
I just looked it up, apparently this is how. I've never cancelled a Brainly subscription before, but hopefully this helps.
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Answer:
y=6x+24
Step-by-step explanation: