The explanatory variable is the amount of exposure the student is given to classical music.
A= (h(a+b))/2
multiply each side by 2
2A = (h(a+b))
divide each side by h
2A/h = a+b
subtract a from each side
2A/h -a = b
A. is the answer llllllllllllllllllllllllllllll
