Cube action?

GNU Backgammon  Position ID: aNvEAQzguyMHAA
                    Match ID   : MAHgAWAAEAAA
    +-1--2--3--4--5--6-------7--8--9-10-11-12-+  O: mpetch
    |       X        O |   | O  O        O  X |  6 points
    |       X        O |   | O  O           X |  On roll
    |                O |   | O  O           X |
    |                O |   |                  |
    |                O |   |                  |
    |                  |BAR|                  |^ 15 pt match (Cube: 1)
    |                  |   |                  |
    |                  |   |                  |
    |                  |   |                O |
    |             X  X |   | X  X           O |
    |          X  X  X |   | X  X     X     O |  2 points
    +24-23-22-21-20-19------18-17-16-15-14-13-+  X: Monty

O on roll. If O doubles, should X take?  Should O double?

    GNU Backgammon  Position ID: e38UAADutgkABg
                    Match ID   : UQngAXAAEAAA
    +24-23-22-21-20-19------18-17-16-15-14-13-+  O: mpetch
    | O  O  O  X     O |   | O                |  7 points
    | O  O  O  X       |   |                  |
    |    O  O          |   |                  |
    |    O  O          |   |                  |
    |       7          |   |                  |
    |                  |BAR|                  |v 15 pt match
    |                  |   |                  |
    |                  |   |                  |
    |    X  X          |   |                  |
    |    X  X  X  X  X |   |                  |  On roll
    |    X  X  X  X  X |   |    X             |  2 points
    +-1--2--3--4--5--6-------7--8--9-10-11-12-+  X: Monty (Cube: 2)

X on roll. If X redoubles, should O take?  Should X redouble?