Foot! The plural form of foot will become 'feet'.
Answer:
The number of copies sold is statistically difficult to determine.
Explanation:
The determination of the number of books sold by a particular author is a <em>difficult task</em> going by the fact that, most of the sale are made online and at various stores. <em>Most of the customers that bought the books hardly leave feedback which would have aided in compiling the total number.</em>
Also, <em>some are sold as hard copies at various stores</em> available within the author's country of residence and outside of it.
In summary, while looking at the Amazon website, I am optimistic that the author, Artwoodwrite was able to sell a substantial amount of the book Brain friction (Wondering of the mind).
Answer :
A complication that makes it difficult for the characters to reach their goal in the story of the monkey’s paw is that the monkey’s paw they use grants their wishes, but it comes at a terrible cost.
Explanation:
This is a sentence. You can tell because it has a subject (Imala) and a verb clause (will play). In addition, it has a direct object *what she is playing* (the solo) and a prepositional phrase for some added clarity (in the concert).