book Maths Puzzle Numerical Ability

solve

(-6x^4+3x^2-16) + (4x^2+4x-7)

please show work
thanks

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book Other Question

Can you help?

4^-1x^2y^-3/6^-1x^-1y^2 simplify

I got 3x^3/2y^5 or 1x^3/2y^5

How far off am I? If possible, simplify the ratinoal expression.

2x - 3 / 4x - 6