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# 20leunge

• I think to make it different from the first time you learned the subject is to make acceleration much faster than the first time you completed it. It would make it so you don't have to spend too mu...

• This is a long post, so I've italicized questions and bolded answers. Let me know if there are any mistakes. The first thing to realize is that we are dealing with finite arithmetic series, that is...

• Just looking at the partial derivative with respect to x, I believe the chain rule is being applied to Q, and then to R along with the product rule. The chain rule is being used because z is itself...

• Here's how I see it. Let x represent the time Rob intended to spend on the project. However, he spent 100% of that times AND 25% more, so 125% of the planned time. So the time Rob actually spent wa...

• RowanH: In general, |x|+|y| ≠ |x+y|. Consider x = 1, y = -1. |x|+|y| = 2 |x+y| = 0.  So. |x|+|y| ≠ |x+y| because 2 ≠ 0. zineb.aj: I'm not sure why you wouldn't want to remove the absolute value sym...

• First, solve x^2=a^2. Take the plus and minus square root of both sides. The negative root is needed because when that is squared on both sides, you still get back the original equation. ==> x=a, x...

• All four solutions: x=2, x=3, x=((-1+sqrt(17))/2), x=((-1-sqrt(17))/2). You have to solve for 3x-5=((x-1)^2) and 3x-5= - ((x-1)^2) because of the absolute value sign on the 3x-5. Plugging in the so...

• What I did was I skipped this part and continued learning until I finished the combinatorics section from Precalculus. Then, I went back and learned it. It's not exactly a recurring topic throughou...

• If you know the mass of water lost, you can calculate using stoichiometry the moles of water. Oxygen has a molar mass of 16.00 grams per mole (g/mol) and hydrogen has a molar mass of 1.01 g/mol. In...

• Nitrogen has 5 valence electrons, so NH3 will have 8 valence electrons total.

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