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The nth term of an arithmetic sequence is given by , where is the first term and is the common difference.
Given: , .
The 9th term is given by .
The sum of the first n terms of an arithmetic sequence is given by .
The sum of the first 12 terms is given by .
First term of the sequence is 10 and common difference is 5.
a1 = -4 and d = 5
Next term = a2=a1+d=-4+5=1
So 9th term is 37
sum of 12 th term is 288