
Yefim S. answered 04/27/21
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S30 = 30/2(a1 + a30); a30 = a1 + 29d = a1 + 29·4 = a1 + 116'
1950 = 15(2a1 + 116); 130 = 2a1 + 116; a1 = 7.
Valerie G.
asked 04/27/21Yefim S. answered 04/27/21
Math Tutor with Experience
S30 = 30/2(a1 + a30); a30 = a1 + 29d = a1 + 29·4 = a1 + 116'
1950 = 15(2a1 + 116); 130 = 2a1 + 116; a1 = 7.
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