book Maths Puzzle Numerical Ability

Suppose you are at a river and rent a motor boat for five hours starting at 7 A.M. You are told the boat will travel 8 miles per hour upstream and 12 miles per hour returning. You

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book Other Question

Use Gaussian elimination to completely solve:
5x+2y+5z=78
-2x+3y-9z=-53
9x-3y+2z=25

My final answer looks like this:
1 0 0 4
0 0 1 8
0 1 0 9

I've been over and over my I think this is the right category to put this in

Evaluate the factorial expression.

(n+5)!/n+5

I got n+5! as my answer. is that right?