book Maths Puzzle Numerical Ability

How many different arrangements of 9 letters can be formed from the letters in the word "SEVENTEEN" ?

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book Other Question

How do I simp 7(2x+2)-9(-1+6x) Simplify and evaluate:
(x2y-4z0/3x6y-3)4

I am not sure if I worked this problem out right. Here it is:

(x2y-4z0/3x6y-3)4

x8 y16/12x24 y12
= y4 z 12x16