Maths- Gym for Brainiacs

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Ali's question:

The position of a particle along a straight line at any time (t) s is given in meters by x(t) = 3t 3 − t 2 + 7t − 1. Find the acceleration of the particle when t = 2s.

1. deriviate x'(t)=9t²-2t+7
2. deriviate x''(t)=18t-2

2. deriviate is a function which describes the acceleration at any given point t For t=2s
x''(2)=18*2-2=34 (m/s²)

I'm under flu so take the answer with caution, maybe I'm right

You actually only do the derivative once, so it's

9t²-2t+7

9(4)-2(2)+7

36-4+7

39

Ali"The Superman"8775 wrote:You actually only do the derivative once, so it's

9t²-2t+7

9(4)-2(2)+7

36-4+7

39

The flu got me I made a mistake 3*3 isn't 6 but 9 ( I corrected the answer in OP). You're wrong boy. If you do it once, you'll get the velocity You have to do it two times

dx(t) /dt= v(t)
dv(t)/dt= a(t)

If you deriviate one time only, the unit m/s² is impossible to get mathematically

I'm no physicist though. I just imagine the velocity as a function which describes the change of position related to time and acceleration as a function which describes the changes in velocity related to time

The answer is 7.

You are right Babun

Find the median of the data points given below.
4, 7, 4, 2, 8, 5, 8, 1, 0, 5, 9

This one is a statistics question.

seriously?

6th term so it must be 5

Been 6 years since i last studied Statistics

Babun's question was pretty easy though

edit:i am not sure of my answer.

Soul wrote:seriously?

What?

ahh mean median mode,, again

Surag wrote:6th term so it must be 5

Been 6 years since i last studied Statistics

Babun's question was pretty easy though

edit:i am not sure of my answer.

I didn't pose the question, I answered for someone else

Ali"The Superman"8775 wrote:You are right Babun

Find the median of the data points given below.
4, 7, 4, 2, 8, 5, 8, 1, 0, 5, 9

This one is a statistics question.

For an odd number of values

As an example, we will calculate the sample median for the following set of observations: 1, 5, 2, 8, 7.

Start by sorting the values: 1, 2, 5, 7, 8.

In this case, the median is 5 since it is the middle observation in the ordered list.

The median is the ((n + 1)/2)th item, where n is the number of values. For example, for the list {1, 2, 5, 7, 8}, we have n = 5, so the median is the ((5 + 1)/2)th item.

median = (6/2)th item
median = 3rd item
median = 5

I'm lazy to type, here the stuff from wikipedia which is right for once
The answer should be obvious if you follow the example Learn to think yourself my friend= maths

I'm not posting questions I don't know, I'm just posting some rough math questions

Kamina wrote:

Surag wrote:6th term so it must be 5

Been 6 years since i last studied Statistics

Babun's question was pretty easy though

edit:i am not sure of my answer.

I didn't pose the question, I answered for someone else

What is the point of this thread then good sir

Surag wrote:

Kamina wrote:

Surag wrote:6th term so it must be 5

Been 6 years since i last studied Statistics

Babun's question was pretty easy though

edit:i am not sure of my answer.

I didn't pose the question, I answered for someone else

What is the point of this thread then good sir

Ali asked me a question in chatbox. I chose to answer in odds & ends
you could use the thread otherwise of course I used it like a notice board

Ali"The Superman"8775 wrote:I'm not posting questions I don't know, I'm just posting some rough math questions

Surag answered your Q already

It can be used for questions that you don't know how to answer or as a thread for you to test your knowledge

That question you asked is kindergarten material.I could answer it despite not studying that subject for more than 6 years

Come up with something better and which would test people's brain

Spoiler:

Surag wrote:That question you asked is kindergarten material.I could answer it despite not studying that subject for more than 6 years

Come up with something better and which would test people's brain

Spoiler:

Here, a fun question of kindergraden level

A toad with very sticky extremities falls down a 10 meter well. Each day, it climbs two meters up, at night when it falls asleep it slids down by 1 meter. How long will the toad need to get out of the well?

Answer and justify why

I was joking man ..lol

I think i am going to be exposed here.

It climbs 2 mts in the day and falls down 1 mt in the night which means in total it climbs 1 mt every day so that makes it 10 days to get out of the well. ?Just gave an answer logically.

I am probably 90 % wrong..You've put me in a spot babun

It never gets out of the well. It dies alone and scared.

Surag wrote:I was joking man ..lol

I think i am going to be exposed here.

It climbs 2 mts in the day and falls down 1 mt in the night which means in total it climbs 1 mt every day so that makes it 10 days to get out of the well. ?Just gave an answer logically.

I am probably 90 % wrong..You've put me in a spot babun

Your answer isn't logicel hence 100% wrong Also, being scarred is the wrong approach

dansik wrote:It never gets out of the well. It dies alone and scared.

Cut toads some slack! I know they aren't the prettiest but the fugly world needs them

P.S. the question is really kindegarden level

9 days

1 + one = ?

Kamina wrote:

Surag wrote:That question you asked is kindergarten material.I could answer it despite not studying that subject for more than 6 years

Come up with something better and which would test people's brain

Spoiler:

Here, a fun question of kindergraden level

A toad with very sticky extremities falls down a 10 meter well. Each day, it climbs two meters up, at night when it falls asleep it slids down by 1 meter. How long will the toad need to get out of the well?

Answer and justify why

it will climb out in the 9th day , wont slide back and take it to the 10th because its already out


this must be a very smart kindergarten because this is a very common question which is asked in the entrance exam i am going to take in May( Common Law Admission Test)

Lord Hades won because RG's answer was incomplete
@Lord Hades, common sense is always questioned

Next question:

Franchise , alexjanosik and friends from Farca section meet RM section in a goallegacy brawl
Franchise says to Jack Daniels: Come over to us and we'll overwelm them with doubled number of posters.
Jack Daniles answers to Franchise: Come over to our side, this way each side will have equal number of posters. The discussion will be active and balanced=> what the forum needs

The question, how many posters participate in the GL brawl from Farca and Real Madrid section?

P.S. junior high level

Again, answer and justify why