Alexandra wants to fire her.
A prefix, which is often the first word part.
Use phases that aid you in memorization of the certain word it's called mnemonics. Such as, "MY Very Excited Mother Just Served Us Nine Pies" to remember "Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, & Pluto." (Planets closest to the sun going away from it.) Also PEMDAS but everyone knows that.
A. It calculates elapsed time more accurately
The writer uses hyperbole to offer a lighthearted joke about the age of the grandmother.