Question 900663
Many possible solutions.  What kind of sequence?


T=F+(n-1)d, general term for arithmetic sequence.
F, first term
n, index of sequence
d, common difference


{{{system(F+(5-1)d=7,F+(8-1)d=8)}}}
{{{system(F+4d=7,F+7d=8)}}}
{{{3d=1}}}
{{{d=1/3}}}

{{{F=7-4/3}}}
{{{F=21/3-4/3}}}
{{{highlight(highlight(F=17/3))}}}----the first term


{{{highlight(T=17/3+(n-1)*(1/3))}}}---general term for this arithmetic sequence