Geometry

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1.If two different lines are perpendicular to the same plane, they are:
a. Collinear
b. Coplanar
c. Congruent
d. Consecutive
I think the answer is B, is that correct?
Also, this:
2. Express 3 radical 75 plus radical 27 all over3 in radical form.
I simplified it to 18 radical 3 over 3, is there anything else I can do with it?
Thanks!

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