This is because spinning the spinner does not affect which marble you pick, as these are mutually exclusive events. This means that if the spinner lands on red, you could choose a black or white marble, and if the spinner lands on green you could also choose a black or white marble.
The only sample space that represents this is D because it's the only one that includes both black and white options after spinning red and green.
The answer is To find how many ounces you need to make, you multiply the number of packs by how many ounces. So, it would look like: 36*2.35=84.6 15*10.8=162
Then you add the ounces together and you have your answer: 162+84.6=246.6 ounces
The data can be modeled using linear equatins, because there's the same amount of population for fish A (+20 per year) and fish B (+30 per year) every year.