SOLUTION: What is the sum of the finite arithmetic series?
(-5)+0+5+10+...+65
a. 900
b. 455
c. 450
d. 445
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Question 853273: What is the sum of the finite arithmetic series?
(-5)+0+5+10+...+65
a. 900
b. 455
c. 450
d. 445
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
65 = -5 + (n - 1)5
n=15
S = ½(-5 + 65)15=450
also
S = ½(2a + d(n-1))n
S = ½(-10 + 5(14))15
S=1/2(60)15=450
c. 450
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