You get extraneous solutions anytime the radical becomes undefined under the set of real numbers. for example

does not exsist since the radical cannot be used on a negative number
Answer:
You can decide where to put the first digit because you know 153 doesn't fit into 6 or 61. But you know it can fit into 613. You put it there.
Answer:
it's B ==35
Step-by-step explanation:
540 in^2 = (30 in)*(x in)
(540 in^2)/(30 in) = x in
18 in = x in
The height is 18 in.