Find a and d for the arithmetic sequence with S31 = 5580 and a31 = 360.
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Hopw this helps!
Answer: a=0
d=12
Step-by-step explanation
s31= n/2 x {a+a31}
5580= 31/2 x {a+ 360}
180x2=a+360
360=a+360
a=0
a31=a+(n-1)d
360 = 0 + (30)d
d=360/30
a=12
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