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. 

the correct order is:

you're your own worst enemy:

they're going to say what they say, but

their opinions aren't holding you

back. it's your self-defeatist

attitude that's keeping your work

from getting its due.

i believe the answer is: b. mr. head had a long, tube-like face with a rounded open jaw and a short depressed nose.

this is because in the un-revised sentence it said that mr. heads face was long and tube-like, and he had a rounded open jaw. this is not a very grammatically correct because of how it seems to drag on with the and, replaced with, with, makes it sound more fluent in the description.