Rhino
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How to graph $y=4x^2-4x^4$
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1 votes

You could just study it as a function: see where it equals zero, take the derivatives and study their signs finding local maxima/minima an then study it's behaviour towards infinity. This should give ...

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Finding the Expected Value and Variance
1 votes

You are integrating the distribution function and not the probability density https://en.wikipedia.org/wiki/Probability_density_function The two are related because the distribution function gives you ...

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How to find the elongation of a spring when it is tied to a brass bar over a tilted wall?
1 votes

First, if you are referring to Varignons' theorem about quadrilaterals and the parallelogram formed by the midpoints of the sides, I don't think you are usinng it. Second, to determine both the ...

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number of ways of inviting 6 friends in a group of 3 for 5 days
1 votes

The answer is $20\cdot 19\cdot 18\cdot 17\cdot 16$. To understand why just think about this, for EACH group you can choose the first day you have 19 options the day after (and so on), so you have $20\...

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