ghollins
25.09.2019 •
Mathematics
Calculate s_24 for the arithmetic sequence in which a_13=1.9 and the common difference is d=3.7
a.-42.5
b.42.6
c.-59.4
d.1.2
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Ответ:
a13=1.9
1.9=a1+3.7(13-1)
1.9=a1+3.7(12)
1.9=a1+44.4
minus 44.4 both sides
-42.5=a1
an=-42.5+3.7(n-1)
S_24, so sum all theway up to a24
S_n=(n(a1+an))/2
a1=-42.5
a24=-42.5+3.7(24-1)=42.6
S_n=(24(-42.5+42.6))/2
S_n=(24(0.1))/2
S_n=(2.4)/2
S_n=1.2
D
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