B) What should be added to –ab + bc + ca to get ab – bc - ca?
1 answer:
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We have that the total students there are 500. The 12-graders there are 200. Probability is defined as the ratio of positive outcomes of an event, over all the possible outcomes. Suppose we pick student randomly. Then, there are 200 positive outcomes (positive outcome: we pick a student in 12th grade) and there are totally 500 outcomes (we can pick 500 students in total from Riverside High School). This ratio gives: 
. The requested probability is 0.40
The amount of water decreases pints in 12 weeks.
Solution:
The amount of water decreases in 7 weeks = pints
The amount of water decreases each week is same.
Let us first change the mixed fraction into improper fraction.
pints =
pints
The amount of water decreases in 1 week
So, the amount of water decreases in 1 week is pints.
The amount of water decreases in 12 week
pints
Hence the amount of water decreases pints in 12 weeks.