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 32 How to put 9 pigs into 4 pens so that there are an odd number of pigs in each pen? 11 What are some examples of notation that really improved mathematics? 11 How to represent the floor function using mathematical notation? 2 7th class question my daughter asked and need answer if possible 2 difficulty working out equation $\int_{-a}^{a}2(\sqrt{a^2-x^2})dx$ =$\left.2[\frac{1}{2}\sqrt{a^2-x^2}+a^2\arcsin(\frac{x}{a})]\right|_{-a}^{a}$

### Reputation (693)

 +5 Choosing pairs of numbers with distinct bounded sum +30 How to represent the floor function using mathematical notation? +108 How to put 9 pigs into 4 pens so that there are an odd number of pigs in each pen? +5 Minimum number of steps needed to solve a rubik cube

### Questions (2)

 10 Minimum number of steps needed to solve a rubik cube 1 Choosing pairs of numbers with distinct bounded sum

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 32 arithmetic 2 recreational-mathematics 11 notation × 2 2 algebra-precalculus 11 definition 1 chemistry 11 functions 1 differential-equations 2 calculus 0 math-history

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