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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609

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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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+118724

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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871

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+118724

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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889

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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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+118724

HAPPY BIRTHDAY CHRIS!

Melody Dec 20, 2021

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+118724

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

+1

inverse of x^(3/5) = x^(-3/5) OR 1/[x^(3/5)]

These two answers are just different ways of expressing the same thing.

MelodyOct 23, 2013

+118724

+1

In 2011, the number of students that enrolled at a school was 965. The number was up by 6.5% on the 2010 number. How many students were at school in 2010. Please who all working thankyou

106.5% (of the 2010 enrolment) is 965 students

106.5% divided by 106.5 = 1%
so
1% must be 965 divided by 106.5 students
so
100% must be 965 divided by 106.5 *100 students

that is 965 / 106.5 * 100 students in 2010

MelodyOct 23, 2013

+118724

+1

Sine ^-1(0.96)

You are being asked for the inverse sine of 0.96
sometimes this is called arc sine 0.96

the answer will be an angle so you must make sure your calculator is in degrees or radian mode, whichever you want your answer in.

on some calcs you will enter
inv sin 0.96 =
on others I think it may be
asin 0.96 =

Really what it means is
If sin(theta)=0.96 Find theta
where
-90degrees <= theta <=+90degrees

MelodyOct 23, 2013

+118724

+1

0.1654
=1.654 * 10 scientific notation
=1.7 * 10 scientific notation with 2 significant figures

MelodyOct 23, 2013

+118724

+1

I have a graphing problem that says 3x-y=1 I have the values for x but i don't know what y would be

okay, just say the values of x that you have are 0 and 2

When x = 0 you put 0 in for x and you get
3x-y=1
3*0 - y = 1
so
0 - y = 1
-y = 1
y = -1
So the point is x=0, y=-1 (0,-1)

When x=2 you substitute 2 for x and you get
3*2 - y = 1
6 - y = 1
-y = 1-6
-y = -5
y = 5
So the point is x=2, y=5 (2,5)

etc

MelodyOct 23, 2013

+118724

+1

it takes mrs brown 75 mins to get to work.at what ime must she leave home o arrive at work at 8.30 a.m.?

75 minutes is 1 hour and 15 minutes
8:30 - 1hour = 7:30
7:30 - 15 minutes = 7:15am

MelodyOct 23, 2013

+118724

+1

'mean' is another word for average.

so if you want to find the mean of a group of numbers you add them all up and then divide by how many there are.

for example
If the scores (numbers) are 2,3,8,5,9 then

mean = (2+3+8+5+9) / 5 = 27/5 = 5.4

The symbol for mean is an x with a bar (line) over the top.

MelodyOct 23, 2013

+118724

+1

find a3 if a1=5584 r=-1/4

Well guest, is that what you meant.

It does sound reasonable, the notation that I am used to is a little different.
And, r usually stands for common ratio, which would make it a geometric progression.

I think the answer is more likely

a ₃= a ₁ * r ^(n-1)

a ₃ = 5584 * (-1/4) ²

a ₃= 349

MelodyOct 22, 2013

+118724

+1

What is your real problem, don't you have a calculator?
I mean, do you want some help on entering it into your calculator or do you want to know how to do it without a calculator.

What is 5.8x10 to the 5 power x 6.4 x 10 to the 2 power

=5.8*6.4 * 10 ⁵ * 10 ²

=37.12 * 10 ⁷

=3.712 * 10 ⁸

MelodyOct 22, 2013

+118724

+1

Probability of an event = number of favourable outcomes / total number of possible outcomes

MelodyOct 22, 2013