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help-10
1effc4c1bee74ed2b8390754d6bca978
509,557,062,326,419,460
kayak
01/27/2022 06:49:16
lmao im dum
1
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Deus_Vult
01/27/2022 06:49:22
lol happens
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1effc4c1bee74ed2b8390754d6bca978
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kayak
01/27/2022 06:49:22
ty tho
1
0
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help-10
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Deus_Vult
01/27/2022 06:49:25
np
0
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help-10
1effc4c1bee74ed2b8390754d6bca978
509,557,062,326,419,460
kayak
01/27/2022 06:49:35
i spent like 40 mins doing it again and again
1
0
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help-10
1effc4c1bee74ed2b8390754d6bca978
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kayak
01/27/2022 06:49:42
i went back to part a and b
1
0
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help-10
1effc4c1bee74ed2b8390754d6bca978
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kayak
01/27/2022 06:49:49
to seee if i was wrong
1
0
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help-10
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kayak
01/27/2022 06:49:53
-__-
1
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help-10
1effc4c1bee74ed2b8390754d6bca978
509,557,062,326,419,460
kayak
01/27/2022 06:49:56
.close
1
0
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help-10
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Jun♾
01/27/2022 06:51:53
https://cdn.discordapp.c…468/IMG_3076.png
IMG_3076.png
1
0
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help-10
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kayak
01/27/2022 06:52:23
the answer is b
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help-10
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kayak
01/27/2022 06:53:00
the equation can be rewritten as y = -(x-2)^2 +3
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Jun♾
01/27/2022 06:53:09
Ok
1
0
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kayak
01/27/2022 06:53:18
since there is a minus in the front we know it is a n curve
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help-10
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kayak
01/27/2022 06:53:23
so its either b or c
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Jun♾
01/27/2022 06:53:26
Yep
1
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help-10
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Jun♾
01/27/2022 06:53:51
How about the negative 2?
1
0
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help-10
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Jun♾
01/27/2022 06:54:05
What can we get from that?
1
0
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help-10
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kayak
01/27/2022 06:54:20
https://cdn.discordapp.c…20127_195414.jpg
20220127_195414.jpg
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help-10
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kayak
01/27/2022 06:54:36
this is like a formula to remember
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help-10
b616f5221e734a34855fa96d00e03580
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kayak
01/27/2022 06:54:43
so treat -a as -2
0
1
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help-10
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Jun♾
01/27/2022 06:54:49
Ok
1
0
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help-10
b616f5221e734a34855fa96d00e03580
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kayak
01/27/2022 06:54:53
the point (a,b) lies on the line
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help-10
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Jun♾
01/27/2022 06:55:03
S0 -a becomes positive?
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help-10
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kayak
01/27/2022 06:55:08
yep
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kayak
01/27/2022 06:55:14
and the one on the outside stays the same
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Jun♾
01/27/2022 06:55:21
Oh right
1
0
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Jun♾
01/27/2022 06:55:31
Oky thanks
1
0
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help-10
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Jun♾
01/27/2022 06:55:39
I have one more question I need help with
1
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Ann
01/27/2022 06:55:55
forgot the ^2 there
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help-10
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Ann
01/27/2022 06:56:00
pretty crucial part of the equation if you ask me
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kayak
01/27/2022 06:56:04
https://cdn.discordapp.c…20127_195551.jpg
20220127_195551.jpg
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help-10
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Ann
01/27/2022 06:56:09
also the square might have a coefficient in front of it
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help-10
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kayak
01/27/2022 06:56:11
ah yes
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help-10
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kayak
01/27/2022 06:56:31
yea mb I tried to simplify it
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Jun♾
01/27/2022 06:56:36
https://cdn.discordapp.c…646/IMG_3077.png
IMG_3077.png
1
0
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help-10
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Jun♾
01/27/2022 06:56:53
How would I do this kind of question?
1
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help-10
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Ann
01/27/2022 06:57:58
you'd probably need to know enough calculus to make judgments about slope and concavity from graphs
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Jun♾
01/27/2022 06:58:08
Oh
1
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Ann
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320
help-10
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Jun♾
01/27/2022 06:58:30
But I barely know calculus
1
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Ann
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Ann
01/27/2022 07:00:14
the alternative is to memorize what signs of coefficients correspond to which "shapes" of cubic functions... but that'll be very forgettable without calculus knowledge
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help-10
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Ann
01/27/2022 07:00:34
personally idk how youre expected to do this without some calculus background
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help-10
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Ann
01/27/2022 07:00:42
at least parabolas are simple enough, but cubics are much less so
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help-10
b616f5221e734a34855fa96d00e03580
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Ann
01/27/2022 07:01:23
like, ok we're told a > 0, which means options C and D are ruled out as they have a negative leading term (as can be seen from their end behavior)
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help-10
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Jun♾
01/27/2022 07:01:33
Ok
1
0
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help-10
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Ann
01/27/2022 07:02:55
one could try looking at the y intercepts btw but you can't rule anything out from that in this problem as all options have it at -6
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Jun♾
01/27/2022 07:03:04
True
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help-10
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Ann
01/27/2022 07:03:34
now i want to say that b = p''(0)/2 so the sign of b controls the concavity of the graph near its y-intercept
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help-10
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Ann
01/27/2022 07:03:46
so one would want to say that our graph should be concave up there
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Ann
01/27/2022 07:03:48
which would be A
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help-10
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Ann
01/27/2022 07:04:08
but if you haven't gotten to that point in your calculus studies, which iirc you haven't, then i don't know how you're expected to arrive at this
0
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help-10
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Jun♾
01/27/2022 07:04:19
Ok
1
0
null
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help-10
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Jun♾
01/27/2022 07:04:44
So if I wanted to solve this question what should I learn In calculus I’m just curious?
1
0
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help-10
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kayak
01/27/2022 07:07:43
the ans is b
0
1
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help-10
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Jun♾
01/27/2022 07:08:29
Oh
1
0
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help-10
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kayak
01/27/2022 07:08:56
what grade are you
0
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help-10
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Jun♾
01/27/2022 07:10:45
10
1
0
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help-10
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kayak
01/27/2022 07:10:55
ooh
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Deus_Vult
01/27/2022 07:10:57
I think a is more likely
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Deus_Vult
01/27/2022 07:11:55
as x is closer to 0m the cube and square terms are much smaller than the first term
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kayak
01/27/2022 07:12:05
https://cdn.discordapp.c…20127_201154.jpg
20220127_201154.jpg
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kayak
01/27/2022 07:12:18
I tried substituting it
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kayak
01/27/2022 07:12:34
I'm assuming the way to find it is the info b is positive
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help-10
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Deus_Vult
01/27/2022 07:13:49
notice that for your second equation the coeff for x^2 is negative
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Deus_Vult
01/27/2022 07:15:12
you can try to imagine the rise and fall of the function as the negative coef, overpowering the positive coefficient in terms of size
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help-10
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Deus_Vult
01/27/2022 07:15:18
for a more intuitive approach
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Deus_Vult
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kayak
01/27/2022 07:16:08
ah yes
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help-10
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kayak
01/27/2022 07:16:11
I just expanded it
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Ann
01/27/2022 07:16:27
??
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kayak
01/27/2022 07:16:31
@Jun♾ mb the ans was a
0
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help-10
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Ann
01/27/2022 07:16:50
second derivatives and concavity
0
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help-10
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Ann
01/27/2022 07:16:55
those are the keywords to look out for
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Jun♾
01/27/2022 07:17:12
Ok
1
0
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help-10
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Jun♾
01/27/2022 07:17:19
It’s okay
1
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kayak
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Jun♾
01/27/2022 07:17:51
I don’t even know how to solve these question yet so it’s not that important
1
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819,818,586,965,016,600
Jun♾
4094
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Jun♾
01/27/2022 07:18:01
Anyways thanks for the help
1
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Jun♾
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help-10
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kayak
01/27/2022 07:18:17
I've never really seen these kind of qns
0
1
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help-10
b616f5221e734a34855fa96d00e03580
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kayak
01/27/2022 07:18:24
but I didn't really learn those in g10
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Ann
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Deus_Vult
01/27/2022 07:18:37
you can try to rule out a
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kayak
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Deus_Vult
01/27/2022 07:18:48
I mean
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kayak
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Deus_Vult
01/27/2022 07:18:50
b**
0
1
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help-10
b616f5221e734a34855fa96d00e03580
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Deus_Vult
01/27/2022 07:19:09
notice that in a, the function has 2 exterma points
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1
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help-10
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Jun♾
01/27/2022 07:19:17
Ok
1
0
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help-10
b616f5221e734a34855fa96d00e03580
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Deus_Vult
01/27/2022 07:19:24
on the poistive side of the x axis
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Jun♾
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kayak
01/27/2022 07:20:14
https://cdn.discordapp.c…20127_201958.jpg
20220127_201958.jpg
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help-10
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kayak
01/27/2022 07:20:16
maybe substitute values and try finding whetehr it's positive
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help-10
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kayak
01/27/2022 07:20:31
that's my best bet now since you havent learnt calc
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help-10
b616f5221e734a34855fa96d00e03580
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Deus_Vult
01/27/2022 07:20:42
now intuitively that would imply that the negative term of the function would be smaller at one positive interval and bigger at another positive interval
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help-10
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Jun♾
01/27/2022 07:21:01
Okay I’m understanding what you mean
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help-10
b616f5221e734a34855fa96d00e03580
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Deus_Vult
01/27/2022 07:21:03
but given that your only possible negative coef is c
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help-10
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Deus_Vult
01/27/2022 07:21:20
then once x^3 x^2 have managed to become bigger than c it will constantly stay on the rise
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help-10
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Deus_Vult
01/27/2022 07:21:29
im obviously speaking very informally yea lol
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help-10
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Jun♾
01/27/2022 07:21:38
Lol
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help-10
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kayak
01/27/2022 07:21:59
what grade do we learn this?
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Ann
01/27/2022 07:22:08
dunno
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help-10
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Ann
01/27/2022 07:22:12
different for everyone
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help-10
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Deus_Vult
01/27/2022 07:22:15
So how is it possible that all of a sudden your function has started decreasing after rising constantly on the positive intervals
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help-10
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Ann
01/27/2022 07:22:21
i never learned _this type of exercise specifically_
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help-10
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kayak
01/27/2022 07:22:27
I'm in g11 and just finished ib am I supposed to know how to do it
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Ann
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help-10
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kayak
01/27/2022 07:22:32
wait not ib
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