Alan

Like so:

Can you take it from here?

Try multi[plying out the following:

Like so:

Can you take it from here?

How about the following:

You could just use g(x) = -3x+11, of course, to get the same answer! 

Here's a graphical check showing the correctness of Melody's answer.

As follows:

The angle sum formula should work:

$\sin {(\frac{2\pi}{15})}\cos {(\frac{4\pi}{5})}-\cos {(\frac{2\pi}{15})}\sin {(\frac{4\pi}{5})}\\ =\sin {(\frac{2\pi}{15})}\cos {(\frac{12\pi}{15})}-\cos {(\frac{2\pi}{15})}\sin {(\frac{12\pi}{15})}\\ =\sin {(\frac{-10\pi}{15})}\\ =\sin{\frac{-2\pi}{3}}\\ = -\frac{\sqrt 3}{2}$

I suspect the following is what is required:

I think N($3,456, $478) is meant to indicate a normal distribution with mean $3,456 and standard deviation $478 (or possibly a variance of $478, as both forms are common, and the poster hasn't specified which).

I'd do it as follows: