Step-by-step explanation:
Sn= n/2[2a1 +(n-1)d]
S25= 25/2[2(-8)+(25-1)2]
S25= 25/2[-16+(24)2]
S25= 25/2[-16+48]
S25= 25/2 (32)
S25= 800/2
S25= 400
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Step-by-step explanation:
Sn= n/2[2a1 +(n-1)d]
S25= 25/2[2(-8)+(25-1)2]
S25= 25/2[-16+(24)2]
S25= 25/2[-16+48]
S25= 25/2 (32)
S25= 800/2
S25= 400