Actually, because z is a variable z times z will always be z^2. The reason this scenario is impossible is because we can assume z is one digit from the addition problem, but there is no single digit number that would create the scenario z + z = zz
Woodstock is correct. When you rationalize the denominator, the top changes to 7√12 and the bottom becomes 6. 4 is a perfect square factor of 12, and 14/6 can be simplified, giving you 7√3/3
In the end, water events were deemed impossible, therefore needles wasn’t a good venue