Mathematics
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OpenStudy (darkbluechocobo):
Help with word problems please.
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OpenStudy (jdoe0001):
2 ducks and 1 pelican
OpenStudy (darkbluechocobo):
OpenStudy (dumbcow):
= 1 good meal
OpenStudy (jdoe0001):
hehe
OpenStudy (darkbluechocobo):
o..o why eat a pelican though
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OpenStudy (jdoe0001):
\(\large \bf (x-{\color{brown}{ h}})^2+(y-{\color{brown}{ k}})^2=r^2\qquad center\ ({\color{brown}{ h,k}})\)
OpenStudy (anonymous):
they really stretch to make these word problems, don't they? why don't they just ask for the center of the circle?
OpenStudy (dumbcow):
general equation for circle
\[(x-h)^2 + (y-k)^2 = r^2\]
center is (h,k)
look at equation they gave you and try to find h and k
OpenStudy (darkbluechocobo):
well it looks llike h is -4 and k is 0
OpenStudy (dumbcow):
@satellite73 ...because someone will always ask, "why do we have to know where center of circle is?"
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OpenStudy (anonymous):
apparently it is in outer space where god made some sort of rectangular coordinate system, but only used two dimensions.
OpenStudy (dumbcow):
@DarkBlueChocobo , careful its (x-h) so h = positive 4
OpenStudy (darkbluechocobo):
ohhh i see
OpenStudy (dumbcow):
its a perfect universe where all orbits are circular and on horizontal plane :)
OpenStudy (darkbluechocobo):
so would it be (4,0) for (h,k)?
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OpenStudy (dumbcow):
yes
OpenStudy (darkbluechocobo):
Can i test out one more just to make sure?
OpenStudy (darkbluechocobo):
whut those question marks
OpenStudy (darkbluechocobo):
(x − 7)^2 + (y − 1)^2 = 36
OpenStudy (darkbluechocobo):
T_T
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OpenStudy (darkbluechocobo):
(x-7)^2 + (y-1)^2=36
OpenStudy (darkbluechocobo):
so it would be (7,1) for the center
OpenStudy (dumbcow):
yep you got it
OpenStudy (darkbluechocobo):
Yay thank you
OpenStudy (dumbcow):
how about
(y+3)^2 + (x-2)^2 = 4
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OpenStudy (darkbluechocobo):
(3,2)?
OpenStudy (dumbcow):
nope .... i reversed the order to see if you were paying attention
h is always with x
k is always with y
it would be (2,-3)
OpenStudy (darkbluechocobo):
T-T i didnt even realize that you switched it
OpenStudy (dumbcow):
y+3 = y -(-3) --> thats why k = -3
OpenStudy (darkbluechocobo):
wows