exam Maths Puzzle Numerical Ability

I sent four questions yesterday, but I have not received a response.

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exam Other Question

Points R,S and T are collinear, with point S between points R and T. if RT= 30, and ST= 2x+4, what is the possible range of values for x? for the function y= 1/x-2 give the values y for x = -1,0,1,2,3,4

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using these points draw a curve