19.6666667 is what i calculated:)
The function appears to be L(legos) = T(tower)^3
L = T^3
This checks out for t =1,2,3,4
The 100th tower would have 100^3 legos.
100^3 = 1,000,000.
The 100th tower would have 1 million cubes
3π = 540 Degrees
Hope it helped :)
The value of x is 16/7
the value of y is 8/7