exam Maths Puzzle Numerical Ability

I am so confused on these problems could someone help me understand what i am suppose to be doing? I am to solve the following inequalities for x

{{{X+4>7}}}

{{{3x<1112}}}

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what is the radius of a circle with a diameter of 8 inches Simplify the expression (625x^4y)^1/4 / (81xy^3)^3/4