exam Maths Puzzle Numerical Ability

I just don't understand what i am supposed to be doing with this. i am supposed to model each rule with a table of values and a graph.

y=x^-4x+4

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exam Other Question

i hope that you can help me solve this one. thanks.
find all real solutions of the equation.
3squareroot3x+1endsqroot -5=0
A ball is thrown upward from the roof of a building 100 m tall with an initial velocity of 20 m/s.

When will the ball reach a height of 80 m?