exam Maths Puzzle Numerical Ability

I am trying to review for a final and would like to get help with A &B:

a. y= (10^x-10^-x)/ (2)
b. y= (e^x +e^-x) / (2)

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exam Other Question

anybody know how to simplify this expression?

16x^2 + 8x - 4 OVER 4

or: 16x^2 + 8x - 4 / 4

thanks for your help. I NEED it. :) Can you help me with factoring polynomials? This does not come from a book it comes from a teacher generated worksheet, thanks.

12x^2-25xy+12y^2