
Zorg S.
asked 09/29/19In an arithmetic series, S12 = 21, t12 = 10. Find t1, t2.
t1=___?____
t2=___?____
PLEASE HELP ME AND THANK YOU VERY VERy MUCH IF YOU DO!!!
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1 Expert Answer

Mark M. answered 09/29/19
Tutor
5.0
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Mathematics Teacher - NCLB Highly Qualified
S12 = (12/2)(t1 + t12)
21 = 6(t1 + 10)
21 = 6t1 + 60
-39 = 6t1
-6.5 =t1
t12 = t1 + 11d
10 = -6.5 + 11d
16.5 = 11d
1.5 = d
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Catalina P.
Can you provide a little more clarity on what you mean by "S12=21"? Is this a typo and you mean t11=21?09/29/19