According to the law of reflection, if the angle of incidence of an incoming ray
of light hitting a mirror is 27°, what is the angle of reflection for the same ray
leaving the mirror?
A.180
B.63
C.153
D.27°

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)

13.46

step-by-step explanation:

16.80 x .20 = 13.46