C. For every decrease of one chore completed, one hour was spent on the internet.
I am not going to give you the answer, but I am going to tell you how to do it. You first put 18 over 1, and multiply that by one half. (You multiply across.)
Answer:
vvvvvvvv
Step-by-step explanation:
A.36
B.5
C.1.70
D.7
E.3.80
F.100
G.14
H.0.64
I.1.02
J.9
Basically you dived the two numbers for your awnser
The question is a scientific inquiry. The explanation does not fit any of the four.