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Mathematics 14 Online
OpenStudy (anonymous):

Never done a logarithmic graph?

OpenStudy (anonymous):

@Isaiah.Feynman

OpenStudy (amoodarya):

do you mean 2^y=5x ?

OpenStudy (amoodarya):

ok now put some y and find x

OpenStudy (amoodarya):

y=0 2^0=5x --->5x=1 --->x=1/5 y=1 2=5x ----> x=2/5 y=-1 1/2=5x ---> x/10

OpenStudy (isaiah.feynman):

The fourth one.

OpenStudy (isaiah.feynman):

|dw:1402543140524:dw|

OpenStudy (amoodarya):

or do like this \[2^y=5x \\ \log_{2} 2^y=\log_{2}5x \\y=\log_{2}5x\\5x>0 \rightarrow x>0\\ \]

OpenStudy (amoodarya):

answer is not 4th

OpenStudy (amoodarya):

because when 5x=1 and y=0 x=0.2

OpenStudy (amoodarya):

answer is 3rd

OpenStudy (isaiah.feynman):

Ahh I see.

OpenStudy (amoodarya):

OpenStudy (amoodarya):

what is right ?

OpenStudy (amoodarya):

if |r|<1 ?

OpenStudy (amoodarya):

first problem was "c" yes

OpenStudy (amoodarya):

\[a1=4,a2=-8\\a1=4\\a2=a1*r=-8\\4(r)=-8\\r=-2\\an=a1*r^{n-1}\\so\\an=4(-2)^{n-1}\]

OpenStudy (amoodarya):

yes b

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