exam Maths Puzzle Numerical Ability

Solve the inequality
-9/13 is less than -6/13x

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exam Other Question

Consider the sequences an and bn defined as :an > 0 , bn > 0 , a(n+1)=an+ (1/bn) , b(n+1)=bn+(1/an)

Prove that a50 + b50 > 20

2find all natural numbers n whish 2^n + If a rectangular solid (4x5x7) is inscribed in a sphere, what is the radius of the sphere? (Is the diameter the diagonal of the rectangular solid? I know it would be if the rectangular solid were a cube.) If so, I got the radius to be 4.7434.