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a10 = a+9d
13 = (-5)+9d
13+5 = 9d
18 = 9d
18/9 = d
2 = d

common difference is 2

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i have aonther ?

just give the question i'll try to solve...

okey here it is Find the 31st term of the following sequence.
9, 15, 21, ...
186
189
195

a31 = a+30d
here a=9 & d=6
therefore,
a31 = 9+30x6
a31 = 9+180
a31=189