Question 867848
{{{f(x)=ba^(-x)+c}}}
{{{lim(x->infinity,f(x))=b*(0)+c=70}}}
{{{c=70}}}
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{{{f(0)=b(1)+70=350}}}
{{{b=280}}}
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{{{f(3)=280a^(-3)+70=105}}}
{{{280a^(-3)=35}}}
{{{a^3=280/35}}}
{{{a=(8)^(1/3)}}}
{{{a=2}}}
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{{{highlight(f(x)=280(2)^(-x)+70)}}}