In+a+arithmetic+sequence,the+sixth+term+is+equal+to+three+time+the+fourth+term+and+the+sum+of+the+first+three+term+is+-12.find+the+sum+of+the+first+ten+terms.
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1
Answer:
-30
Step-by-step explanation:
a+5d=a+3d
2d=0
a+3d+3/2(2a+2d)=-12
4a+4d=-12
a+d=0
10/2(2a+9d)=10/2×2×-3=-30
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