Discover Questions

Can u show me the solution please.. Thank u? What kind of glasses do I need to see an eclipse? How many ways can rook travel from lower left corner to upper right on chessboard size of 2015x2015 in exactly 4 moves? The speed of Earth is higher than max. speed of plane. Why not the sound waves produced of Earth like a plane? If [logX base(2)] + [logY base(3)] >6 then the least value of (X+Y) is?