Question 1102569
{{{y=r(x)}}}


{{{r(x)=mx+b}}}
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{{{m=0.7}}}
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{{{r(x)=0.7x+b}}}


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{{{r(0)=12}}}------------{{{b=12}}}


{{{highlight(r(x)=0.7x+12)}}}



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r(x), length of nail
x, number of weeks
{{{m=0.7}}}, slope, growth rate in mm per week
b, initial length