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8
volunteer
domain and range okay.
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volunteer
so for the domain first we would have to factor and simplify the function
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volunteer
as you can see the problem factored and got 3x+1/x+3
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student
ohhhh okay so how would i get the 5/3
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volunteer
to find the range you would need to solve for x
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volunteer
so you see how you have the function
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student
okay
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student
now HERE is where i really struggle at tbh
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volunteer
okay which one do you need help with specifically?
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student
how would i know what to right when it says approaching from the left or right if its looks like the same thing
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student
write*
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student
for example 1
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volunteer
so when you are approaching the limit from the right side it literally means from the right side
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volunteer
for example for part D
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volunteer
it says find the limit as x approaches 2 from the right
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volunteer
you would look at the x value 2
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volunteer
and see what y value it approaches from the right side
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volunteer
you can see its a value of 1
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volunteer
does that make sense?
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student
ohhhh okay so what about part L
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student
like how did we get that answer
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volunteer
L would be 1
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volunteer
because 1 is your limit
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volunteer
oh wait
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volunteer
you are talking about part L
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volunteer
sorry i misunderstood
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student
ur good!!!
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volunteer
okay so for part L
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volunteer
in order for the limit to exist we have to make sure that both sides (aka limit as x approaches 5 form the left and limit as x approaches 5 from the right) are the same
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volunteer
that way the limit as x approaches 5 can exist
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volunteer
so if you look on the left and right side of 5 do they both approach the same value?
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student
oh Okay i see so i would look at the arrow going down right?
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volunteer
yes you would!
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student
okay i think im getting the hang of it
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volunteer
yup!
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student
OKAY NOW THISSSSS
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student
is crazy
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volunteer
ah finding the limit numerically
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student
i would just use the calculator for this though right ???
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volunteer
yes you would
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volunteer
but do you understand what the values mean?
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student
tbh no..
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volunteer
okay lets go over it
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student
okay
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volunteer
so the question is asking to find the limit as x approaches 3 of that function
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volunteer
and if you notice when you plug in 3 you get undefined
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volunteer
so plugging in 3 would not work
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student
yes
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volunteer
we could estimate the limit using values super close to 3
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student
ohhhh okay
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student
i see
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volunteer
so you use numbers super close to 3 and plug it in
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student
thats the whole point correct
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student
to find which one is closet
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volunteer
from the right and left side if they approach the same value the limtit would be that value
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volunteer
yes
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volunteer
you have to make sure that the f(x) is approaching the same number
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student
wait huh?
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volunteer
at x = 2.999 and x = 3.001
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student
f(x) is approashing what
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volunteer
f(x) is the value you get after plugging in those super close numbers
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volunteer
f(x) is the limit
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student
ohhh ookkk
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volunteer
at 2.999 and at 3.001 those values are approaching the same limit
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volunteer
so thats why it works
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student
Okay i see now
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student
wait can i go check 1.1 really quick to see if i need help understanding to
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volunteer
yes!
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student
okay the only question I have about this problem is how would i put this into the calcukator
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volunteer
ok so for this one its asking for average velpcioty from 2 seconds to 8 seconds
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volunteer
do you recall the average velocity formula?
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student
distance/time ?
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student
sum like det
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volunteer
right
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volunteer
its the change in displacement/time
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student
okk
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volunteer
so that means we to find d(8) - (d(2))/ (8-2)
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volunteer
sorry (d(8) - d(2))/(8-2)
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volunteer
do get d(8) you would plug 8 into the distance equation
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volunteer
and same for 2
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student
okayyy i remember that part
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student
so thats all im findning
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student
right or
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volunteer
yes and you put it all together into the average velocity formula
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volunteer
and remember your units
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student
okkkkk thats smart!
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student
okay wait so how would i even start by making a sketch for a problem based on limits n stuff
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student
because I rmb we did it in class but i dnt know about a problem pretaining to it
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volunteer
interesting is this still on limits? or is this for derivatives
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student
limits i think
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student
tbh im not sure
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volunteer
oh wait sorry i misread that v means vehicles not velocity in this context
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student
ok
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volunteer
just give me a second to figure out this problem
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student
no problem, take ur time
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volunteer
okay!
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volunteer
so you need help with part b right?
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student
yes
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volunteer
okay so for this we are just graphing the time vs the number of vehicles
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volunteer
so at each time there would be some number of vehicles
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