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@@ Interest questions.

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Hello everyone,

I have been getting requests to start writing a wrap again.  Thanks to those people.

I used to write these daily but the forum was much smaller then and I had more time to devote to it.

I cannot revisit this idea, sorry.

BUT

I have been collecting some interesting questions and answers this past week or so and I would like to present them.

I have not seen all, or even most, of the questions and answers so I am sure there are some really good ones which are not included.  Sorry about that

Please if you would like me to present your or someone else's next time you NEED to send me the address by private mail. (or if you are a guest maybe your can atract my attention in a more imaginative way)

I would really appreciate any suggestions, as it is an indication that you are really interested in twhat I present and I want the writers of great answers to get the recognition that they deserve.   :))

I do not want all the answers to be by recognised mathematicians.  Other people write great answers too :)

Anyway - here are some that I have collected, I hope that some enjoyment is gleaned from them   :)

1.  Understanding different bases.      Melody       15-9-16

http://web2.0calc.com/questions/suppose-b-and-c-are-positive-integers-when-b-2-is-written-in-base-c-the-result-is-121_c-when-c-2-is-written-in-base-b-the-result#r1

2. Polar form to rectangular form.   Thanks CPhill

http://web2.0calc.com/questions/convert-the-following-polar-equations-to-rectangular-form-r-5sin-0-r-sin-0-cos-0#r2

3. Difficult trig manipulation question.    Melody

http://web2.0calc.com/questions/math_59008

4. Poisson distribution     Thanks Alan

http://web2.0calc.com/questions/probability-statistics_1

5. Probability – b***s and boxes    Thanks Chris J

http://web2.0calc.com/questions/how-many-ways-are-there-to-put-4-b-s-in-3-boxes-if-the-b-s-are-distinguishable-but-the-boxes-are-not/new#edit

6. B***s and boxes    Melody and Ginger and Alan

http://web2.0calc.com/questions/bin-a-has-one-white-ball-and-four-black-b-s-bin-b-has-three-b-s-labeled-1-and-one-ball-labeled-7-bin-w-has-five-b-s_1

7. Aps and GPs                       Thanks Gino

http://web2.0calc.com/questions/arithmetic-sequence-problem-set

8. Calculus                                   Thanks  Alan and Omi67

http://web2.0calc.com/questions/if-f-x-x-2-1-x-find-f-1

9. A look at repeating decimals      Thanks   Skgr136

http://web2.0calc.com/questions/is-9-99999-repeating-forever-equal-to-one

10. The mathematics of motion in a line.      Thanks Electric Pavlov  (24/9/16)

http://web2.0calc.com/questions/when-a-car-s-brakes-are-applied-it-travels-5-feet-less-in-each-second-than-the-previous-second-until-it-comes-to-a-complete-stop-a-car-goes-45-feet-in-the

11. The differential at a point IS the gradient of the tangent to the curve at that point.

Findingthe equation of a tangent.                                                    Thanks Omi.

http://web2.0calc.com/questions/if-f-x-7x-2-x-3-find-f-1-and-use-it-to-find-an-equation-of-the-tangent-line-to-the-curve-y-7x-2-x-3-at-the-point-1-6

12. Binary, nibbles, hexadecimal and base 10            Melody

http://web2.0calc.com/questions/computiung

MELODY

Sep 26, 2016

#1
0

Effectively

Oct 27, 2016
#2
0

((4800*(1-0.1)+14677.64)/(1+x)+((4602.45*(1-0.1)+14677.64)/(1+x)^2+((4400.94*(1-0.1)+14677.64)/(1+x)^3+((4195.41*(1-0.1)+14677.64)/(1+x)^4+((3985.77*(1-0.1)+14677.64)/(1+x)^5+((3771.93*(1-0.1)+14677.64)/(1+x)^6+((3553.82*(1-0.1)+14677.64)/(1+x)^7+((3331.34*(1-0.1)+14677.64)/(1+x)^8+((3404.42*(1-0.1)+14677.64)/(1+x)^9+((2872.95*(1-0.1)+14677.64)/(1+x)^10+((2636.86*(1-0.1)+14677.64)/(1+x)^11+((2396.04*(1-0.1)+14677.64)/(1+x)^12+((2150.41*(1-0.1)+14677.64)/(1+x)^13+((1899.87*(1-0.1)+14677.64)/(1+x)^14+((1644.31*(1-0.1)+14677.64)/(1+x)^15+((1383.65*(1-0.1)+14677.64)/(1+x)^16+((1117.77*(1-0.1)+14677.64)/(1+x)^17+((846.57*(1-0.1)+14677.64)/(1+x)^18+((569.95*(1-0.1)+14677.64)/(1+x)^19+((287.80*(1-0.1)+14677.64)/(1+x)^20=-240000

X=?

Dec 25, 2016
#3
+7825
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LOL Guest, you serious??

MaxWong  Dec 29, 2016
#4
+349
+7

For Guest's question. It took 3 hours but i had nothing else to do so yeah whatever. Probably wrong

18072.3 + 18997.6/(x + 1) + 18819.8/(x + 1)^2 + 18638.5/(x + 1)^3 + 18453.5/(x + 1)^4 + 18264.8/(x + 1)^5

x = -1.51032 - 0.865886 i

x = -1.51032 + 0.865886 i

x = -0.510056 - 0.866066 i

x = -0.510056 + 0.866066 i

Dec 30, 2016