exam Maths Puzzle Numerical Ability

Hi. Can someone please help me? I need to solve these arguments using the 18 rules of inference. I'm stuck on these 4.

I. 1) [A horseshoe (B v C)] horseshoe (D horseshoe A)

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exam Other Question

Calculate the speed of the following:
A man runs 1000 metres in 184 seconds (calculate his speed in kiometres per hour)

thankyou 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.