Question

Please help explain this

Answer 1

http://prntscr.com/1anlb6

Answer 2

@dumbcow @Gators88

Answer 3

you rang...haha

Answer 4

crap you're gonna make me read

Answer 5

:D

Answer 6

what can i do you are the genius here :D

Answer 7

so goal is to find rate the birds are dying off so we can predict when they will go extinct
this is finding slope from algebra
\[slope = \frac{y_2 -y_1}{x_2 -x_1} = \frac{50,000 - 1,000,000}{40} = -23,750\]
at that rate how long before you reach 50,000
\[23,750t = 50,000\]
t = 2. something
so between 2 and 3 yrs

check my math, ididnt use a calc :{

Answer 8

Yay, i did exactly like this :D
although i didn't use the slope formula but i used the same logic.
FYI your math is perfect :)

Answer 9

good to hear

Answer 10

any others?
im getting off pretty soon

Answer 11

yeah one more!

Answer 12

actually two more :P

Answer 13

http://prntscr.com/1anlb6

Answer 14

and http://prntscr.com/1anqc6

Answer 15

1st link is a copy of bird problem

2nd link :
solve for "x" in terms of y .... then add 4 to both sides
its way too complicated to try to get "x+4" on 1 side first

Answer 16

so what should i do ? :3

Answer 17

here is the 2nd link http://prntscr.com/1aeuva

Answer 18

get "x" terms on 1 side
\[xy -2x = 9-4y\]
then the trick is to factor out the "x"
\[x(y-2) = 9-4y\]
divide
\[x = \frac{9-4y}{y-2}\]
add 4
\[x+4 = \frac{9-4y}{y-2}+\frac{4(y-2)}{y-2}\]
simplify right side...

Answer 19

where is this 4 coming from?
just because it's in question we can add it in the equation?

Answer 20

@dumbcow ?

Answer 21

oh sorry i was working on the other problem ...geometry :{

yes we can add anything we want as long as you do it to both sides of equation

Answer 22

k im pretty sure answer is E 1:12 just by eliminating the other possibilities
i dont know how to prove its the answer though

Answer 23

sorry im late lol

Answer 24

yeah its at least 1/9

Answer 25

@Gators88 hey maybe you are better at geometry proofs

Answer 26

i am sorry for late reply, my internet wasn't working >.<

ok i got the answer for the first link


but what about the 2nd link i can't get it ! >.<

Answer 27

if you draw the third median from point P to bisect opposing side, you can see the triangle broken up into thirds (with the intersection point being the centroid). MNQ only lies in two of those, and is smaller in one than the other

Answer 28

@Gators88 could you explain it with a diagram?

Answer 29

the answer is E btw

Answer 30

here is what i can deduce:

Answer 31

how did you deduce this :@ i mean from where the 4x comes from?

Answer 32

iam sorry but i am become really dumb at times
you've got to explain me this !

Answer 33

ok i have a picture of the 1:12

Answer 34

how do i upload?

Answer 35

i forgot the name of the thm but for a centroid the diagonal NR is split into 2:1 ratio so NS = 1/2 SR
MS = 1/2 SQ

also
MN = 1/2 QR by proportions

triangle NPM has sides half that of PQR ... thus area is in ratio of 1:4
similarly since MNS has sides half that of QRS ... ratio of their areas is 1:4

that is where the 4x comes from

Answer 36

post the link @Gators88

Answer 37

i used colors to indicate where it keeps breaking in half

Answer 38

its in my photo album

Answer 39

sorry im new lol

Answer 40

i could sketch it real quick in here even, where are the tools?

Answer 41

no just use the "attach file" button

Answer 42

you can upload anything from your computer

Answer 43

on an ipad...i dont see attach file?

Answer 44

yeah i got till here then? @dumbcow

Answer 45

below the text box you should see some blue buttons....."Equation" , "draw" "attach file" "post"

Answer 46

hmmm...maybe my settings are off. one sec

Answer 47

ok well in the mean time, you basically just have to draw a line segment from p to s. S is the centroid of the triangle, so you can cut each third in half from there. then cut them in half again...when you get to this point there are 12 triangles, and MNS are each half of one...making them 1/24th

Answer 48

@Gators88 i cannot visualize this :(

Answer 49

@dumbcow what should i do further?

Answer 50

1 sec

Answer 51

Il write it step by step

Answer 52

i got nothing ...from there i said
x+4x+2? = 3/4
estimate 2? as at least 1/4 area

then
5x = 1/2
x = 1/10
so that gives an upper estimate

Answer 53

yeah thats a good way to estimate, but you can see it exactly by using PS, QS, and RS. redraw it without MN in the picture, it throws off the visualization.

Answer 54

SN cuts the left triangle in half. SM cuts the right triangle in half. Draw a line segment from S to the approx center of QR

Answer 55

Yes. now repeat process for each sixth. then connect MN ....each part of MNS are half of a triangle!

Answer 56

so you have .5(1/12) + .5(1/12)

Answer 57

for the upper two triangles, i drew bisector from M & N, not S. that will help visualize

Answer 58

oh ok

Answer 59

upper two red triangles*

Answer 60

lol thanks for assisting cow, this is driving me nuts haha