exam Maths Puzzle Numerical Ability

Write the equation of the line passing through the given pair of points
(2,-3) and (2,4)

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exam Other Question

Racquetball. The volume if rubber (in cubic centimeters) in a hollow rubber ball used in racquetball is given by
V=4/3 pie r ^3 - 4/3 pie r^3
Where the inside radius is r centim
If n= 3p, for what value of p is n = p?

according to the answer provided on the back of the book, the answer is zero. However, i think the book is incorrect and the real answer is 1/3.

How do you solve this question?