[b]p1.[/b] You can do either of two operations to a number written on a blackboard: you can double it, or you can erase the last digit. Can you get the number $14$ starting from the number $458$ by using these two operations?


[b]p2.[/b] Show that the first $2011$ digits after the point in the infinite decimal fraction representing $(7 + \sqrt50)^{2011}$ are all $9$’s.


[b]p3.[/b] Inside of a trapezoid find a point such that segments which join this point with the midpoints of the edges divide the trapezoid into four pieces of equal area.


[b]p4.[/b] New chess figure called “lion” is placed on the $8 \times 8$ chess board. It can move one square horizontally right, or one square vertically down or one square diagonally left up. Can lion visit every square of the chess board exactly once and return in his last move to the initial position?
You can choose the initial position arbitrarily.


PS. You should use hide for answers.
1. Start with the number \( 458 \).
2. Double \( 458 \) to get \( 916 \).
3. Erase the last digit of \( 916 \) to get \( 91 \).
4. Double \( 91 \) to get \( 182 \).
5. Double \( 182 \) to get \( 364 \).
6. Erase the last digit of \( 364 \) to get \( 36 \).
7. Double \( 36 \) to get \( 72 \).
8. Double \( 72 \) to get \( 144 \).
9. Erase the last digit of \( 144 \) to get \( 14 \).

Thus, it is possible to get the number \( 14 \) starting from \( 458 \) by using the given operations.

The final answer is \( \boxed{ 14 } \)