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Never done a logarithmic graph?
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@Isaiah.Feynman
do you mean 2^y=5x ?
ok now put some y and find x
y=0 2^0=5x --->5x=1 --->x=1/5 y=1 2=5x ----> x=2/5 y=-1 1/2=5x ---> x/10
The fourth one.
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|dw:1402543140524:dw|
or do like this \[2^y=5x \\ \log_{2} 2^y=\log_{2}5x \\y=\log_{2}5x\\5x>0 \rightarrow x>0\\ \]
answer is not 4th
because when 5x=1 and y=0 x=0.2
answer is 3rd
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Ahh I see.
what is right ?
if |r|<1 ?
first problem was "c" yes
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\[a1=4,a2=-8\\a1=4\\a2=a1*r=-8\\4(r)=-8\\r=-2\\an=a1*r^{n-1}\\so\\an=4(-2)^{n-1}\]
yes b
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