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

F=Ye^t for t Use rational exponents to write x^1/5*y^1/8*z^1/4 as a single radical expression. Choose the correct expression:
a) root:40:xyz
b) root:40:x^8y^5z^10
c) root:160:xyz
d) root:40:(xyz)^23