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a=7 a+9d=2(a+d) 7+9d=2(7+d) 7+9d=14+2d 14-7=9d-2d 7÷7=7d÷7 d=1 1. a+18d 7+18(1) =25 2. Sn=n÷2[2a+(n-1)d] 28÷2[2(7)+(28-1)1] 14[14+27] 14[41] =574 3. 9th term=a+8d 7+8(1) =15 6th term=a+5d 7+5(1) =12 Difference=15-12=3
