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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I am having a problem solving this problem:
For the equation x - the square root of x = 0 , perform the following:
Solve for all values of x that satisfies the equation
Thanks for your help. Could you please help?
Young's rule of thumb method is used to determine the portion of an adult dose of medication to administer to a child. If A represents the age of the child