PLEASE HELP ME I WILL GIVE OUT THE BRAIN THING AND EXTRA POINTS

Each row (A, B, C, D) represents a fraction. What fraction do you get when you subtract row D from row A?
A) 1/2
B) 1/3
C) 1/4
D) 1/6

Hey free points ! people i have a few math questions on my profile consider looking at them i have to get done in 30 mins!

Find the unit rate. enter your answer as a mixed number. a fertilizer covers 2/3 square foot in 1/2 hour.

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $36.98. find the probability that a randomly selected bill will have an amount greater than $173, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?