Question 352080
{{{a=8}}}
{{{r=-3/4}}}
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{{{S=sum(8r^n,n=0,infinity)}}}
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{{{S=8*sum(r^n,n=0,infinity)}}}
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{{{S=8*(1+sum(r^n,n=1,infinity))}}}
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{{{S=8*(1+r/(1-r))}}}
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{{{S=8*(1+(-3/4)/(1+3/4))}}}
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{{{S=8*(1+(-3/4)/(7/4))}}}
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{{{S=8*(1-3/7)}}}
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{{{S=8*(4/7)}}}
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{{{highlight(S=32/7)}}}
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You can then get the answer to 2 decimal places.