Does this graph represent a function? Why or why not? 10
8
2+
0
810
-8
-8
-10
A. Yes, because it has two straight lines.
B. No, because it fails the vertical line test.
O c. No, because it is not a straight line.
D. Yes, because it passes the vertical line test.

answer: okw

step-by-step explanation:

what is the original number? you forgot to add it.

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

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)