Mathematics
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user35508
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I am a 9th grader learning new topics.

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question
10
Finding the last two digits of a number
May 29, 2017
answer
8
The expression $\sqrt{13+3\sqrt{\frac{23}{3}}} +\sqrt{13-3\sqrt{\frac{23}{3}}} $ is which type of number?
Mar 8, 2017
answer
8
Show that $\frac{1}{a^n+b^n+c^n} = \frac{1}{a^n} + \frac{1}{b^n} + \frac{1}{c^n}$
Feb 27, 2018
answer
7
Find the value of the series $\frac{8}{5} + \frac{16}{65} + \frac{24}{325} + \frac{32}{1025} + ...$ to 20 terms.
Aug 12, 2020
answer
7
Find $\sum_{r=1}^{20} (-1)^r\frac{r^2+r+1}{r!}$.
Aug 22, 2020
answer
7
The roots of the equation $x^4-8x^3+ax^2-bx+16=0$ are positive if
Mar 11, 2017
answer
6
Find $1^2+3^2+...99^2$ given $1^1+2^2+...+100^2$ and $1^1+2^2+...+50^2$
Mar 14, 2017
question
6
Is my proof of $\lim_{x\to \infty}\frac 1x = 0$ correct?
Feb 10, 2017
answer
6
Let $p=1+\frac{1}{\sqrt 2}+\cdots\frac{1}{\sqrt {120}}$ and $q=\frac{1}{\sqrt 2}+\frac{1}{\sqrt 3}+\cdots\frac{1}{\sqrt {121}}$ then
Aug 12, 2020
answer
6
Finding $ \int \frac{5x^2-x-4}{x^5+x^4+1}dx$
Mar 27, 2017
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Chromium cyanide complexes

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