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kinziemadison12
25.08.2020 •
Mathematics
What is the sum of the arithmetic series: s10 = -20, d = 4, a1 =?
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Ответ:
first term a1 is -40.
Step-by-step explanation:
in an arithmetic series,
sum of first term terms (S10) = -20
Common difference (d) = 4
first term (a)= ?
number of terms (n)= 10
now,
S10 =( n÷2) [a1 +(n-1) d]
or, -20 = (10÷2) [a1 + (10-1) 4]
or, -20 = 5 ( a1 + 36)
or, -4 = a1 + 36
or, a1 = -40
Ответ:
Step-by-step explanation:
I do not know sorry