Mathematician

3!4!7! = 2n!

Divide both sides by 2:

(3!4!7!)/2 = n!

Expand the factorials:

(2 * 3 * 2 * 3 * 4 * 2 * 3 * 4 * 5 * 6 * 7)/2 = n!

Divide out the 2:

(3 * 2 * 3 * 4 * 2 * 3 * 4 * 5 * 6 * 7) = n!

Order the numbers on the left side, leaving duplicates at the end:

(2 * 3 * 4 * 5 * 6 * 7 * 2 * 3 * 3 * 4) = n!

Group the numbers at the end so that they form the succeeding numbers from the current run (current run ends at 7):

(2 * 3 * 4 * 5 * 6 * 7 * (2 * 4) * (3 * 3)) = n!

(2 * 3 * 4 * 5 * 6 * 7 * 8 * 9) = n!

Turn the left back into a factorial:

9! = n!

n! = 9!

n = 9

3 - 1/6 = 7i

17/6 = 7i

17/6 - 7i

Yes.

15√106 / 50

Divide the top and bottom by 5:

(15√106/5) / (50/5)

3√106 / 10

The answer of 550% can be found by realizing that 1 is 100%

5.5 = 1 * 5.5

5.5 = 100% * 5.5 = 550%.

550% *

It's 25 + -2, not 25 + 2, so the answer's 23, not 27.

Disregard this; I was thinking of skew lines.

Listen to geno3141, below:

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Which don't you get how to do?

The only one which seems like it may be troublesome is the transversal. Are you sure it's not perpendicular?

If it's transversal lines, then you can only really do it in 3D, since transversal lines are by definition on different planes.

If you're really unsure, you should ask your teacher what she wants on the specific parts you're confused about.

If you're trying to do fractions, you can just enclose each term in parenthesis.