Question 965253
{{{a[n]=a[0]+(n-1)*d}}}
{{{a[0]=13}}}
{{{a[1]=13+d=8}}}
{{{d=-5}}}
{{{a[n]=13+(n-1)(-5)}}}
{{{a[n]=13-5n+5}}}
{{{highlight(a[n]=-5n+18)}}}
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{{{a[8]=-5(8)+18}}}
{{{a[8]=-40+18}}}
{{{highlight(a[8]=-22)}}}