exam Maths Puzzle Numerical Ability

What is the range of the function : -2(y-4)=5(^x+2) ? I think it is y such that y is greater than 4.

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exam Other Question

Let R(x)=x+1/x-1. If T(x) = R(x)+1, Then T(x)=
a)2x/x+1
b)x+2/x+1
c)x+2/x-1
d)2x/x-1
How do I solve: simplify the equation with rational exponents

25 1/2 + 27 1/3