It would be B. I had this same question.
Answer:
I WISH I COULD HELP BUT I CANT SORRY
Step-by-step explanation:
I CANT HELP IM NOT IN YOUR GRADE I'm in middle School
Answer:
BBBBBBBBBBBBBBBBBBBBBBBBBBBB
The first one is 43/72 which can’t be simplified
The second one is 17/18
Answer:
C= 82.1116
k=-0.0007192
Step-by-step explanation:

Applying logarithmic properties yields in the following linear system:

Solving for k:

Solving for C:

C= 82.1116
k=-0.0007192