b. Solvethe following:
1. Find the sum of the 9 terms of the series 7, 14, 21, ...
2. Find the sum of the arithmetic series with the given values as indicated:
ai= 8, d= 2, n= 8
3. Find the sum of the even integers from 1 to 50.
4. Find the sum of the odd integers between 30 and 50.
5. Find the sum of the multiples of 5 from 20 to 70.
1. Find the sum of the 9 terms of the series 7, 14, 21, ...
2. Find the sum of the arithmetic series with the given values as indicated:
ai= 8, d= 2, n= 8
3. Find the sum of the even integers from 1 to 50.
4. Find the sum of the odd integers between 30 and 50.
5. Find the sum of the multiples of 5 from 20 to 70.
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Answer:
1. 315
2. 120
3.650
Step-by-step explanation:
1. Sn= 9/2 [2(7)+(9-1)7]
Sn= 9/2 (70)
Sn= 315
2. Sn= 8/2 [2(8)+(8-1)2]
Sn= 4 (30)
Sn= 120
3. Sn= 25/2 (2+50)
Sn= 25/2 (52)
Sn= 25 (26)
Sn= 650
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