Mathematics
10 Online
OpenStudy (anonymous):
how do i do these?
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OpenStudy (anonymous):
wat
OpenStudy (anonymous):
OpenStudy (anonymous):
you gotta compute
\[\huge d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}\]
OpenStudy (anonymous):
-3 an 5 for the x
OpenStudy (anonymous):
in your case
\[\huge d=\sqrt{(-3-5)^2+(2+1)^2}\]
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OpenStudy (anonymous):
yeah right
OpenStudy (anonymous):
you can do it in the other order too
OpenStudy (anonymous):
-6 an 3
OpenStudy (anonymous):
cause \((-3-5)^2=(-8)^2=64\) and \((5+3)^2=8^2=64\) so it makes no difference what comes first
there is no 6 in the question is there?
OpenStudy (anonymous):
i ment 8 sry
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OpenStudy (anonymous):
let me know what you get when you compute \[\huge d=\sqrt{(-3-5)^2+(2+1)^2}\]
OpenStudy (anonymous):
8 sqware an 3 sqwart itss 49 plus 9? not sure what 8 time 8 is
OpenStudy (anonymous):
i don't think 8 squared is 49...
OpenStudy (anonymous):
im not sure what it is
OpenStudy (anonymous):
\[8\times 8=?\]
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OpenStudy (anonymous):
gotta know your multiplication tables, but if all else fails use a calculator!
OpenStudy (anonymous):
64
OpenStudy (anonymous):
yay
OpenStudy (anonymous):
so yeah, \(64+9=?\)
OpenStudy (anonymous):
73
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OpenStudy (anonymous):
bingo
OpenStudy (anonymous):
then?
OpenStudy (anonymous):
then i guess you choose the right answer from the list ...
OpenStudy (anonymous):
\[ d=\sqrt{(-3-5)^2+(2+1)^2}=\sqrt{8^2+3^2}=\sqrt{64+9}=\sqrt{73}\]
OpenStudy (anonymous):
is the first on alway minus?
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OpenStudy (anonymous):
no the first one is whatever you want it to be given your choices
OpenStudy (anonymous):
\[(3,-2),(1,4)\] you could do
\[\sqrt{(3-1)^2+(-2-4)^2}\] or
\[\sqrt{(1-3)^2+(4+2)^2}\] makes no difference