exam Maths Puzzle Numerical Ability

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?

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exam Other Question
Is this sequence arithmetic? What are the next three terms of this sequence?
1,1/2,1/3,1/4,... I sent four questions yesterday, but I have not received a response.