exam Maths Puzzle Numerical Ability

Describe the locus of all points in space that are 5 cm from point P.
choices:
circle P with a radius of 5 cm
cube with 5 cm sides
sphere P with a radius of 5 cm
cube with 5 cm sides

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exam Other Question
The midpoint of AB is (3sqrt5,2sqrt3). If the coordinates of the endpoint B are (-sqrt5,1/2sqrt3), then what are the coordinates of endpoint A? 50. A rock is thrown from the top of a tall building. The distance in feet, between the rock and the ground t seconds after it is thrown is given by d= -16t^2-2t+524. How long after the rock is thrown is it 321 feet from the ground?