TASK DEFINITION: Given the Question and Answer pair, detect whether the answer is acceptable or not. Denote acceptable answer as "yes", otherwise denote as "no". An acceptable answer is consistent with the context in question, detailed, long, and uses general knowledge of English. Answers that are not definite and suggest a variety of options are not acceptable answers.
PROBLEM: Question: There is the verb quicken to make something quick or faster, but Merriam-Webster doesn't list slowen. What is the verb to make something slow (as in 'reduce in speed', not 'something that is slow')? 
Answer: There is also decelerate, which is the opposite of accelerate. From M-W verb to move slower : to lose speed.

SOLUTION: no

PROBLEM: Question: I'm referring to the peculiar habit I sometimes see in formal documents, where a number is given numerically after it's spelled out. It seems quite redundant: I need five (5) kumquats, stat! (Though it isn't always in a legal context, might it be related to this answer on this question?) 
Answer: I looked into this myself recently and couldn't find a definitive answer. The best I came up with was that numeric values in a formal document or contract are often crucial to its purpose. Restating a number in parentheses after spelling it out is a way to ensure the reader that the number is correct. It also draws the eye to the numbers, allowing for quick perusal of a document, say a purchase order. These are practical reasons; whether there is some historic reason for it I do not know.

SOLUTION: no

PROBLEM: Question: Sometimes people are referring to mechanical objects as "she": I love my car. She always gets the best service. Are there any rules when it is appropriate to use "she" instead of it, and is "he" ever used in such context? 
Answer: The pronoun "she" is sometimes used to refer to things which can contain people such as countries, ships, or vehicles, or when referring to certain other machines. This, however, is considered a stylistically marked, optional figure of speech. This usage is furthermore in decline and advised against by most journalistic style guides such as the Chicago Manual of Style.[9] If used, the terms she, her, and hers are always used, regardless of the entity's name - for example, "The U.S.S. John F. Kennedy (CVA-67) was laid down October 22, 1964. She was launched on April 1, 1967..." "He" in reference to an inanimate object has not, as far as I'm aware, ever been common usage in English.

SOLUTION:
yes