3. by default, blender® remembers your last 32 actions and allows you to undo them one at a time by pressing ctrl+z. (1 point) true false 4. when designing a scene in blender, you must make sure that which of the following is turned on so that numpad hot keys will work properly? (1 point) vertix num lock extrude mode origin key

Answers:

(3) True
(4) Num Lock

Explanations:
(3) To undo any task in most of the softwares including Blender, CTRL + Z is used. If you want to double check, go to preference ->  Input -> Search for undo. You would see CTRL + Z shortcut there for one time undo (as shown in the picture 1 attached.) Hence (TRUE).

(4) As in blender, during the scene creation, the designers usually use top, left, right or bottom view. Blender has the built-in keys set for those views. As you can see in the second image that the Top view is set to NumPad 7 (likewise others set to other numbers). In order to use the those numpad numbers, you must turn on the NumLock! Hence NumLock is the answer.

Iwould go with windows