Last night, jason introduced me to a friend of his. whose hair was all the way down to the back of his knees in a single dreadlock. is this sentence correct

Incorrect sentence.

Corrected sentence: Last night, Jason introduced me to a friend of his, whose hair went all the way down to the back of his knees in a single dreadlock.

The period before the word "whose" in the original creates a fragment "Whose hair was all the way down to..." This is a phrase which is describing "a friend of his" and should be included in the same sentence. So you simply separate it by a period. 

“way of writing” should be replaced with “writing style"

“idea” should be replaced with “purpose.”

maybe   “people from a long time ago” should be replaced with “elizabethans.”

the tale of “aunty misery” written by judith ortiz cofer , is a folk tale about an old woman who earns immortality by tricking death . the cost of immortality however, is that her life will stay the same. from this tale it becomes clear that death is a necessary evil and is inevitable in life.  

question: which theme is found in the tale of "aunty misery? ”

answer: a. death may not seem friendly, but he should be treated kindly.