Melody

921 Questions
34315 Answers

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Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
read more ..

Melody Apr 2, 2022

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Reporting problems.

There are a number of people having problems at the moment.
If you lodge an error can you please give all relevant information that you can think of.
Where you are in the world - the city or the country - is often very important information. read more ..

Melody Mar 16, 2022

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How to make an empty rectangle in Latex

I just worked out how to make an empty box of various horizonal size easily in LaTex.
This is not a recommended method, but other methods that I have tried here have not worked.
This coding is really simple. Just put letters inside read more ..

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Melody Mar 15, 2022

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HAPPY ANNIVERSARY CHRIS! (CPhill)

I just realized that you became a member here exactly 8 years ago today!

It has been great to have you here all that time

off-topic

Melody Mar 13, 2022

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WELCOME BACK CPHILL !

Melody Feb 11, 2022

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Very interesting question. No high level maths required.

This question was posted a couple of days ago.
https://web2.0calc.com/questions/geometry_73561

I think it is really interesting. It looks much more difficult than it really needs to be. read more ..

Melody Feb 1, 2022

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Members have a better experience. Their questions get more attention.

Almost everyone is posting as a guest.
If you post as a member your questions will have a far greater chance of a timely and helpful response.
If you are a genuine learner and interact with us, you will become known and answerers will do read more ..

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Melody Jan 9, 2022

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HAPPY BIRTHDAY CHRIS!

Melody Dec 20, 2021

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Some guidelines for question askers.

Please note:
1) Ask only one question per post.
2) When asking a question talk about what you have tried for yourself. Then people will take you more seriously and will be more able and willing to help.
3) If you get an answer read more ..

off-topic

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Melody Nov 4, 2021

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Remeniscing - a little historical humour.

I just found this old post that some of you, who have been around for a while, might find amusing.

https://web2.0calc.com/questions/look-at-the-new-leader-board

off-topic

Melody Oct 29, 2021

+118724

0

I don't know what you mean AND you cannot take the log of a negative number.

MelodyOct 17, 2013

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0

When you multiply fractions first right them upright, not sideways like you have to on the computer.
then, simpliy multiply the tops and put the answer on the top
and multiply the bottoms and put the answer on the bottom

(1.2/294.15) ( x / 838.15)

top 1.2*x
bottom 294.15 * 838.15

answer =[ 1.2 / ( 294.15 * 838.15) ] x

I haven't explained very well but hopefully you can understand.

MelodyOct 17, 2013

+118724

0

The question is in Portugese, this is the translation.

What is the number 1283 in scientific notation?

You need just one non-zero digit in front of the point so it'll start with 1.283

1283 is a big number, bigger than 1 so the power will be positive
now the point moved 3 places so the power is +3

so
1.283 * 10 ³

If it was a little number, smaller than 1, it would have been a negative power.

NOW FOR THE PORTUGESE TRANSLATION (from google) I hope it makes sense.
------------------------------------------------------------------------------------------------------------------
AHORA A LA TRADUCCIÓN PORTUGUÉS (de google) Espero que tenga sentido.

La cuestión es en portugués, esta es la traducción.

¿Cuál es el número 1283 en notación científica?

Sólo se necesita un dígito diferente de cero delante del punto de lo que va a empezar con 1.283

1283 es un número grande, más grande que 1 por lo que la potencia será positiva
ahora el punto mudó 3 lugares por lo que la potencia es 3

así
1.283 * 10 [sup] 3 [/ sup]

Si se trataba de un pequeño número, menor que 1, que habría sido una potencia negativa.

MelodyOct 17, 2013

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0

I haven't finished it but you start by using the identity

tan(a+b) = [tan(a) +tan(b)] / [1- tan(a)tan(b)]

Do the substitution, then use arc sin
dont forget to consider the angle restrictions.

MelodyOct 17, 2013

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0

first, there is no e on the mathematical pi.

4 times pie =s+5pie

4pi =s+5pi

you just need to subtract 5pi from both sides to get the value of s.

MelodyOct 17, 2013

+118724

0

MelodyOct 17, 2013

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huh?

do you mean

asin 0.5 =

or in another calc maybe

inv sin 0.5 =

You do need to make sure your calculator is set to degrees or radians - whichever you are working in.
The answer to this is 30 degrees because
sin 30 degrees = 0.5

MelodyOct 17, 2013

+118724

0

f(x)=480(0.83)^t t=5

I think you have made a copy error
it should be

f(t)=480(0.83)^t t=5

f(5)=480(0.83) ⁵
[/sup]
= 189 animals

MelodyOct 17, 2013

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I'm sorry I don't understand what you are asking. Your question doesn't make sense.
An interval is not a point. 0 could be the beginning or end of an interval but it cannot be an interval.

MelodyOct 17, 2013

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ok first

(2+h) ³

=(h+2) ³

=(h+2)(h+2)(h+2)

=(h+2) (h ²+4h+4)

= h ³ +4h ² + 4h + 2h ² + 8h + 8

= h ³ +6h ² + 12h + 8

This is not the whole question of course,hopefully you can so the rest of the simplifying yourself

I am actually wondering if the question is copied correctly, you have =1 are you sure it is not =0 ?

MelodyOct 17, 2013