anonymous
  • anonymous
Math question help please !
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
what is the question?
anonymous
  • anonymous
3 CD is a water pipeline. A and B are two towns. A pumping station is to be located on the pipeline to pump water to A and B. Each town is to pay for their own service pipes and insist on equality of costs. a Where should C be located for equality of costs to occur? b What is the total length of service pipe re- quired? c If the towns agree to pay equal amounts, would it be cheaper to install the service pipeline from D to B to A?
anonymous
  • anonymous
using the graph from this website http://www.haesemathematics.com.au/samples/sa11gt-5_02.pdf

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anonymous
  • anonymous
page 83: number 3
anonymous
  • anonymous
|dw:1327729372654:dw|
anonymous
  • anonymous
A(2,3) B(5,4)
anonymous
  • anonymous
Is anybody answering this?
anonymous
  • anonymous
not me- i forgot how 2, same question i had last year =P all urs
anonymous
  • anonymous
kk :) ill try it
anonymous
  • anonymous
i found A but im confused on parts B and C
anonymous
  • anonymous
wait, are you doing the IB?
anonymous
  • anonymous
yes
anonymous
  • anonymous
haha, yeah, I'm using the same textbook. Ill post the answers in a few minutes. I'm writing it out.
anonymous
  • anonymous
alright thank you !
anonymous
  • anonymous
ok so is the first one 7/3?
anonymous
  • anonymous
yess
anonymous
  • anonymous
do you know how to do that?
anonymous
  • anonymous
for the second part i got confused on what is the total distance
anonymous
  • anonymous
i used the distance formula for both AC & BC made them equal eachother
anonymous
  • anonymous
What do they give for an answer??
anonymous
  • anonymous
7/3 for A
anonymous
  • anonymous
for C: 8.03km
anonymous
  • anonymous
i mean for B
anonymous
  • anonymous
and for C yes (6.16 km)
anonymous
  • anonymous
yes, it makes sense
anonymous
  • anonymous
part b is 8.03(i got 8.027 lol)
anonymous
  • anonymous
rounded up for B
anonymous
  • anonymous
but how did you get B?
anonymous
  • anonymous
all you need to do is take one set of the coordinates like (2,3) and use the coordinate of the pipeline and put them into the distance formula. (7/3, 7) You get around 4.0138646..... multiply that by two as there are two service pipes, one for B and one for A and you get 8.027 or 8.03 as they say
anonymous
  • anonymous
so get the distance between the two points and times it by 2?
anonymous
  • anonymous
yes...getting the distance for one only gives you the cost for one service pipeline. That only gives water to either A or B. Both need it right?
anonymous
  • anonymous
yeahh..
anonymous
  • anonymous
and the second one is 6.16 and yes. the distance from B to D is 3(just subtract the y-values) the distance from B to A is 3.16(distance formula should give you sqrt 10 which is 3.16 in decimal) add them together and you get 6.16 which is a shorter distance then 8.03 so it would be cheaper.
anonymous
  • anonymous
can you do 3b because i got 8.11
anonymous
  • anonymous
nevermind i did it the wrong way !
anonymous
  • anonymous
but im kindda lost on 3C
anonymous
  • anonymous
ok...so what do you need to get in 3C? the distance from D to B to A right?
anonymous
  • anonymous
so i need to find D for 3c
anonymous
  • anonymous
for finding D what points do i use? A and B right?
anonymous
  • anonymous
noooo, no, why would you need to? the right angle sign indicates that it is a straight line going down.
anonymous
  • anonymous
ohhh so if i find d to b i can get b to a
anonymous
  • anonymous
|dw:1327731671265:dw|
anonymous
  • anonymous
do you get it?
anonymous
  • anonymous
yes i got it !
anonymous
  • anonymous
can you help me with with the next question?
anonymous
  • anonymous
the one where it says "jason's girlfriend lives in a house on China..."
anonymous
  • anonymous
ok!
anonymous
  • anonymous
thanks !
anonymous
  • anonymous
wait, is it possible for you to write or screen shot the question because my preview just froze from all the pdfs :S sryy
anonymous
  • anonymous
Jason's girlfriend lives in a house on Clifton Highway which has equation y = 8. The distance from Jason's house is 11.73 km. If Jason lives at J(4,1), what are the coordinates of his girlfriend's house? y=8 o-------------------------------------… <- Clifton Highway K(a,8) -- let x = a Distance JK = 11.73 km = 11.73 units o J(4,1) Scale: 1 unit = 1 km Okay legend: o (small o) represents a point. Point K is imaginary (I placed it there for visual reference i.e. lets pretend that its there, you are trying to find the x value. Point K is the location of Jason's girlfriend's house. And the distance between their houses is 11.73
anonymous
  • anonymous
ok, what's the answer it gives?
anonymous
  • anonymous
im guessing -5.41
anonymous
  • anonymous
yeah i got the probblem !
anonymous
  • anonymous
??you got how to do it?
anonymous
  • anonymous
all right :) good job XD

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