book Maths Puzzle Numerical Ability

Evaluate the algebraic expression:

11v + vw^2 - w when v=12 and w = -3

I came up with 243, my college tutor came up with something different. Is this correct?

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book Other Question

Find an equation for the line with slope 1/2 and y-intercept 3.
I came up with 2x-y=3. Is this correct? MUST SOLVE USING PERMUTATIONS</b>

On a bookshelf there are 9 books. In how many ways can you select 4 books to read in order?

I would greatly appreciate your assistance with this problem.