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To be or not to be
Arithmetic Series
Find that Sum
How many terms??
100
Am I an arithmetic sequence? 12,9,6,3,
Yes
100
What is the forumla for an Arithmetic Series
Sn=n*(a1+an) -------------- 2
100
Find S13 if you are given a1=2 and a13=122
S13=806
100
Find n if a1=20, d=7 and an=181
24
200
Am I an arithmetic sequence? -4, -7, -10, -12, -14, ...
No
200
What does n stand for in the formula for Sn?
The number of terms you are summing up
200
Find the sum of the first ten terms of the following sequence: 7+9+11+...
160
200
Find n given a1=19, an=96 and Sn=690
12
300
Am I an arithmetic sequence?? 2, 4, 8, 16, ...
No
300
Write the next three terms in the arithmetic series -140-202-264...
...-326-388-450
300
In an arithmetic series, find the sum of the first 20 terms if the first term is -12 and the common difference is -5.
-1190
300
Find n in the series: 14+11+8...-82
33
400
Write an arithmetic sequence that has 4 terms and a common difference of -7. Letter A: start with a negative number Letter B: start with a positive number Letter C: start with zero Letter D: continue letter A's pattern
Answers will vary
400
Cans are stacked in a display of rows with 1 can in the top row, 4 cans in the second row, 7 cans in the third row and so on. If there are 298 cans in the bottom row, how many cans total are there in the display?
14,950 cans
400
Find the sum of the series 3-3-7-11...-51
-350
400
Find n when a1-15, an=79 and Sn=423
9
500
Write an arithmetic sequence that starts with the number 1020, has 5 terms, and has a common difference of... Letter A: -10 Letter B: -100 Letter C: 2 Letter D: 50
Letter A: 1020, 1010, 1000, 990, 980, ... Letter B: 1020, 920, 820, 720, 620, ... Letter C: 1020, 1022, 1024, 1026, 1028, ... Letter D: 1020, 1070, 1120, 1170, 1220, ...
500
Find the sum of this series
8.9,17.8,26.7,35.6,44.5 ... 1619.8
an=8.9n
Sn=(182/2)(8.9+1619.8)
500
In the arithemtic series, find the sum of the first n terms if the first term is -11, the common difference is 4, and the nth term is 137.
2384
500
In an auditorium the first row had 3 seats, the second row had 8 seats, and the last row had 83 seats. How many rows of seats were there?
17