Answer:
-4 + (-3) + (-2) + (-1) + 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 35
Sn = ½(a1 + an)n, n = 14 (since there are 14 numbers from -4 to 9.), a1 = -4, an = 9
S14 = ½(-4 + 9)14
S14 = ½ (5)14
S14 = ½ (70)
S14 = 35
The answer matches with the first one (both 35), so the answer is 35.
Hope this helps. ^^
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Answers & Comments
Answer:
-4 + (-3) + (-2) + (-1) + 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 35
Sn = ½(a1 + an)n, n = 14 (since there are 14 numbers from -4 to 9.), a1 = -4, an = 9
S14 = ½(-4 + 9)14
S14 = ½ (5)14
S14 = ½ (70)
S14 = 35
The answer matches with the first one (both 35), so the answer is 35.
Hope this helps. ^^