Answer:
1) 8
2) 1
3) 7
4) 3
5) 5
________
formula: an = a + (n – 1)d
1) d = 8
an = 7 + (n - 1) 8
an = 7 + 8n - 8
an = 7 - 8 + 8n
an = -1 + 8n
2) d = 1
an = 8 + (n - 1) 1
an = 8 + n - 1
an = 8 - 1 + n
an = 7 + n
3) d = 7
an = 11 + (n - 1) 7
an = 11 + 7n - 7
an = 11 - 7 + 7n
an = 4 + 7n
4) d = 3
an = 7 + (n - 1) 3
an = 7 + 3n - 3
an = 7 - 3 + 3n
an = 4 + 3n
5) d = 5
an = 4 + (n - 1) 5
an = 4 + 5n - 5
an = 4 - 5 + 5n
an = -1 + 5n
note: try and solve the 2nd to 4th one if necessary only!
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Answers & Comments
Answer:
1) 8
2) 1
3) 7
4) 3
5) 5
________
formula: an = a + (n – 1)d
1) d = 8
an = 7 + (n - 1) 8
an = 7 + 8n - 8
an = 7 - 8 + 8n
an = -1 + 8n
2) d = 1
an = 8 + (n - 1) 1
an = 8 + n - 1
an = 8 - 1 + n
an = 7 + n
3) d = 7
an = 11 + (n - 1) 7
an = 11 + 7n - 7
an = 11 - 7 + 7n
an = 4 + 7n
4) d = 3
an = 7 + (n - 1) 3
an = 7 + 3n - 3
an = 7 - 3 + 3n
an = 4 + 3n
5) d = 5
an = 4 + (n - 1) 5
an = 4 + 5n - 5
an = 4 - 5 + 5n
an = -1 + 5n
note: try and solve the 2nd to 4th one if necessary only!