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help-10
7057872de5a649baa6c7d1f8312b7033
163,892,364,681,674,750
madlor
04/04/2022 11:04:58
#❓how-to-get-help <- probably worth reading
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Kirooo中川
04/04/2022 11:05:01
Ok thanks
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madlor
04/04/2022 11:05:11
glgl
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omsincoconut
04/04/2022 11:05:12
what’s the result
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Kirooo中川
04/04/2022 11:06:21
I don't remember, I already erased it. But the result were both of the variables still there
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Kirooo中川
04/04/2022 11:06:29
If that makes sense
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madlor
04/04/2022 11:08:51
what do you know about probability distributions clavite?
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madlor
04/04/2022 11:12:50
you're gonna have to put in some effort here
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help-10
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madlor
04/04/2022 11:13:11
are you familiar with what probability is?
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madlor
04/04/2022 11:13:17
yes
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madlor
04/04/2022 11:14:00
reminder:
https://cdn.discordapp.c…7463/unknown.png
unknown.png
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madlor
04/04/2022 11:14:26
i am happy to help you find the solution, its not complicated
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madlor
04/04/2022 11:16:40
no worries, do you have some intuition as to what probability means?
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madlor
04/04/2022 11:18:50
chance of something happening or whatever
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madlor
04/04/2022 11:19:08
a probability distribution is in a sense a table of possible outcomes
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madlor
04/04/2022 11:19:24
it is the collection of possible things that can happen, and how likely they are to happen
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madlor
04/04/2022 11:20:19
with this understanding of what a probability distribution is, can you decipher what they are *really* asking here yet?
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madlor
04/04/2022 11:23:00
ohhh
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madlor
04/04/2022 11:23:09
F
1
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madlor
04/04/2022 11:23:28
so are you officially out of time?
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madlor
04/04/2022 11:23:53
anyways since its a probability distribution, something *has* to occur
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omsincoconut
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madlor
04/04/2022 11:23:59
so all the probabilities must sum up to 1
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madlor
04/04/2022 11:24:19
thats how u determine the probability when x=4
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a disappointing son
04/04/2022 11:42:45
@Moderators
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Edd
04/04/2022 11:43:04
.close
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linglingbee
11/11/2021 16:39:13
Moments question: it says its on the point of tilting about C, so what I did is at A the force is 0, however the markscheme takes A into account
https://cdn.discordapp.c…9708/unknown.png
unknown.png
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linglingbee
11/11/2021 16:39:46
this is what i did so far but its wrong
https://cdn.discordapp.c…3092/unknown.png
unknown.png
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Plurmorant
11/11/2021 16:40:31
tilting about C just means C is the fulcrum
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Plurmorant
11/11/2021 16:41:11
and since it's barely tipping, the platform can only push up at that point
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linglingbee
11/11/2021 16:45:09
but for example in this question
https://cdn.discordapp.c…6224/unknown.png
unknown.png
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linglingbee
11/11/2021 16:45:25
it also says its on the point of tilting about C and D is considered 0
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Plurmorant
11/11/2021 16:47:53
that question is pretty different because it has 2 fulcrums that might push up
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Plurmorant
11/11/2021 16:48:09
there if it tilts on C then it's barely not touching D so it can't apply a force
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linglingbee
11/11/2021 16:50:10
so is it because there force at D is a reaction force upwards whereas in the first questsion there is a weight applied to A so it's downwards and it still is considered even though its about to tilt?
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Plurmorant
11/11/2021 17:08:23
yeah all the downward forces will still be there
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Plurmorant
11/11/2021 17:08:37
when things are tilting sometimes some upward forces become 0
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Plurmorant
11/11/2021 17:08:42
because they lose contact
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T🤫
04/04/2022 11:48:51
need help with 5bii
https://cdn.discordapp.c…3615/unknown.png
unknown.png
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Deleted User
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Deleted User
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T🤫
04/04/2022 11:49:39
if someone could show me how to do the 1st one then ill try to do the rest
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T🤫
04/04/2022 11:56:29
i found 4 for the first one but not sure if im right
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ChuFta
04/04/2022 13:54:00
is this incorrect, i think it is but the solution says its correct
https://cdn.discordapp.c…6041/unknown.png
unknown.png
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ChuFta
04/04/2022 13:54:36
also here, is the second interval just a set {1.3}
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ChuFta
04/04/2022 13:54:39
https://cdn.discordapp.c…5792/unknown.png
unknown.png
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Dracô
04/04/2022 14:02:13
It's correct
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ChuFta
04/04/2022 14:02:57
how, its union, it should be <10,22>
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Dracô
04/04/2022 14:03:49
Oh wait lol I noticed wrong one I thought it was [11, 21) U (12, 22)
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help-10
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Dracô
04/04/2022 14:04:01
Yes it shall be (10, 22)
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ChuFta
04/04/2022 14:04:12
tnx
1
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Dracô
04/04/2022 14:04:34
Yes it shall stay the same
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Dracô
04/04/2022 14:05:23
[0.3, inf) has {1.3} element in it
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ChuFta
04/04/2022 14:05:55
yes but does <1.3] mean just {1.3}
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Dracô
04/04/2022 14:06:22
Idk lol we use (a, b] notation of an interval
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Dracô
04/04/2022 14:06:37
(1.3] doesn't make sense
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ChuFta
04/04/2022 14:06:40
yea, us too idk what this is
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Dracô
04/04/2022 14:06:55
Either they mean (1, 3] or {1.3}
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Dracô
04/04/2022 14:07:43
Ig the mistake was done during typing
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ChuFta
04/04/2022 14:08:06
also, would you know how to prove if a^3>b^3, then a>b, its logical i dont know how to prove it
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ChuFta
04/04/2022 14:08:11
probably
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ChuFta
04/04/2022 14:10:20
actually wait
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Dracô
04/04/2022 14:10:37
If a³>b³ Then a³-b³>0 a³-b³ = (a²+b²+ab)(a-b) So (a-b)(a²+b²+ab)>0
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Dracô
04/04/2022 14:12:09
Which is only possible if a-b>0 and (a²+b²+ab)> 0 .... (i) or a-b<0 and (a²+b²+ab) <0.... (ii)
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ChuFta
04/04/2022 14:17:35
2nd line, for eg. a=-5 b=-2, -2ab=-20, -ab=-10, so -2ab is not >=-ab
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Dracô
04/04/2022 14:20:28
Oh wait I took the wrong case Do RMS≥GM
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Dracô
04/04/2022 14:21:19
But wait it can't be done like that too because for that a>0, b>0
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ChuFta
04/04/2022 14:21:55
why does it have to be >0
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ChuFta
04/04/2022 14:22:10
it can be negative
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Dracô
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ChuFta
04/04/2022 14:22:13
any real number
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ChuFta
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Dracô
04/04/2022 14:22:41
Because assume a<0 and b>0 Then for GM you shall write (ab)^1/2
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b33f3f7177cf4e03ade344f245258bad
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Dracô
04/04/2022 14:22:52
So we can't use that approach
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b33f3f7177cf4e03ade344f245258bad
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ChuFta
04/04/2022 14:23:42
also, sorry for jumping around shouldnt this be (a<=0 and b>=0) or (a>=0 and b<=0)
https://cdn.discordapp.c…3150/unknown.png
unknown.png
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ChuFta
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Dracô
04/04/2022 14:27:40
For which part?
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ChuFta
04/04/2022 14:28:10
is my solution correct
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ChuFta
04/04/2022 14:28:39
the results say (a>=0 and b<0) or (a<=0 and b>0)
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Dracô
04/04/2022 14:28:40
Yes
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ChuFta
04/04/2022 14:28:50
but b can be 0 too
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ChuFta
04/04/2022 14:28:54
thanks
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ChuFta
04/04/2022 14:30:59
now about the previous one could i just explain like this, if we "exponent"(idk how to say in english) both sides of an inequality, the validity remains because the sign doesnt "flip" since the exponent is an odd number and a bigger number multiplied by itself 3 times is still bigger than the smaller number multiplied ...
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b33f3f7177cf4e03ade344f245258bad
562,871,150,762,262,500
Dracô
04/04/2022 14:32:06
Ok hmm a²+b² + ab must be greater than 0
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help-10
b33f3f7177cf4e03ade344f245258bad
562,871,150,762,262,500
Dracô
04/04/2022 14:32:08
@ChuFta
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help-10
b33f3f7177cf4e03ade344f245258bad
562,871,150,762,262,500
Dracô
04/04/2022 14:32:12
The reason is
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help-10
b33f3f7177cf4e03ade344f245258bad
562,871,150,762,262,500
Dracô
04/04/2022 14:32:49
a² + b² + ab = 1/2 ( 2a² + 2b² + 2ab)
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ChuFta
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help-10
b33f3f7177cf4e03ade344f245258bad
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Dracô
04/04/2022 14:33:10
1/2 ( a² + b² + 2ab + a² + b²)
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help-10
b33f3f7177cf4e03ade344f245258bad
562,871,150,762,262,500
Dracô
04/04/2022 14:34:22
It becomes 1/2 { (a+b)² + a² + b²}
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help-10
b33f3f7177cf4e03ade344f245258bad
562,871,150,762,262,500
Dracô
04/04/2022 14:35:08
(a+b)²>0 , a²>0 , b²>0
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help-10
b33f3f7177cf4e03ade344f245258bad
562,871,150,762,262,500
Dracô
04/04/2022 14:35:59
Implying 1/2 { (a+b)² + a² + b²) > 0 => a² + b² + ab> 0
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help-10
b33f3f7177cf4e03ade344f245258bad
562,871,150,762,262,500
Dracô
04/04/2022 14:36:18
So only case (i) possible that
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help-10
b33f3f7177cf4e03ade344f245258bad
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Dracô
04/04/2022 14:36:23
a-b>0
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help-10
b33f3f7177cf4e03ade344f245258bad
562,871,150,762,262,500
Dracô
04/04/2022 14:36:28
=> a>b
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help-10
b33f3f7177cf4e03ade344f245258bad
562,871,150,762,262,500
Dracô
04/04/2022 14:36:33
Convinced?
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help-10
b33f3f7177cf4e03ade344f245258bad
562,871,150,762,262,500
Dracô
04/04/2022 14:36:54
@ChuFta
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b33f3f7177cf4e03ade344f245258bad
403,868,346,455,556,100
ChuFta
04/04/2022 14:37:05
im reading 1 sec
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help-10
b33f3f7177cf4e03ade344f245258bad
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ChuFta
04/04/2022 14:37:40
oh thats cool
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b33f3f7177cf4e03ade344f245258bad
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ChuFta
04/04/2022 14:37:41
thanks
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b33f3f7177cf4e03ade344f245258bad
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Dracô
04/04/2022 14:39:01
:sadcatthumbsup:
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ChuFta
04/04/2022 14:39:29
wait, one more :D
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Dracô
04/04/2022 14:39:37
:stareeyebrows:
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ChuFta
04/04/2022 14:40:53
https://cdn.discordapp.c…2208/unknown.png
unknown.png
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ChuFta
04/04/2022 14:41:14
it says prove the statement for every number a -1<a<0 the thing "works"
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help-10
b33f3f7177cf4e03ade344f245258bad
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Dracô
04/04/2022 14:41:51
Oh
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ChuFta
04/04/2022 14:41:53
https://cdn.discordapp.c…20404_204145.jpg
20220404_204145.jpg
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