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The probability of picking a ball from a bag is the number of balls of that colour divided by the total number of balls.

Therefore in the first instance, the probability of a red ball is 3/9 or 1/3...

For the first ball the probability we pick a red ball is the same, it's the number of red balls divided by the total number of balls. Which in this case is 3/9. 

If we replace the balls the chance ...

First of all, one can tell a lot about the structure of these molecules by looking at their full names - Adenosine triphosphate and deoxyribose nucleic acid.

There are many structural similarities ...

First Step: - {-2[x-3y+12]-5z-30} Second Step: - {-2x+6y-24-5z-30} Third Step (Order is x,y, then z) : - {-2x+6y-5z-54} Final Step: 2x-6y+5z+30

To make sure you're making a well-informed argument, you ought to use a structure that is backed up by plenty of evidence. To think about this you can use the PEEL method: P is for POINT- make your point ...