the answer would be E because if you round answer E to 3mph and divide by 2 you get 1.5 and a hour is 60 minutes divide that by 2 and you get 30 minutes however you walked slightly slower so it would take 5 minutes longer.
Answer:
everything is in the picture
The explanatory variable is the amount of exposure the student is given to classical music.
Lets solve it
first multiply each term by x :-
x^2 - 7 = 6x
x^2 - 6x - 7 = 0
(x - 7)(x + 1) = 0
x = 7 and x = -1
