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20leunge commented,
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...

20leunge commented,
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...

20leunge commented,
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...

20leunge commented,
All four solutions: x=2, x=3, x=((1+sqrt(17))/2), x=((1sqrt(17))/2). You have to solve for 3x5=((x1)^2) and 3x5=  ((x1)^2) because of the absolute value sign on the 3x5. Plugging in the so...

20leunge commented,
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...

20leunge commented,
I would say differential calculus.

20leunge commented,
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...

20leunge commented,
I imagine you would have to use the Lambert W function, but I'm not familiar with it.

20leunge commented,
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...

20leunge commented,
Nitrogen has 5 valence electrons, so NH3 will have 8 valence electrons total.

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