6. Evaluate the arithmetic series when a1 = 15, d = 2, n=15.
a. 1728
b. 435
c. 860
d. 868
7. Determine the number of terms n if the given are a1 = 18, d = 10 Sn = 258
a. 7
b. 9
c. 6
d. 8
a. 1728
b. 435
c. 860
d. 868
7. Determine the number of terms n if the given are a1 = 18, d = 10 Sn = 258
a. 7
b. 9
c. 6
d. 8
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Answer:
b.435
Step-by-step explanation:
Using two formulae, first
a_n = a_1 + (n - 1)d
a_15 = 15 + (15-1)2
a_n = 15 + (14)2
a_15 = 15 + 28 = 43.
Next, S_n = n
Answer:
walang example lodi, dapat may example para answer ko po