SOLUTION: Find the 15th term and the sum of the first 15 terms for the following sequences. a) 12, 17, 22, �. b) 4, 10, 16, �.

Question 286007: Find the 15th term and the sum of the first 15 terms for the following sequences.
a) 12, 17, 22, �.
b) 4, 10, 16, �.
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!

Find the 15th term and the sum of the first 15 terms for the following sequences.
a) 12, 17, 22, �.
b) 4, 10, 16, �.
.
The formula is:
nth term = a + [(n - 1) * d]
where
a is the first term
n is the nth term
d is the distance
.
a) 12, 17, 22, �.
d is 5
n is 15
15th term = 15+[(15-1)*5] = 15+[14*5] = 15+[70] = 85
b) 4, 10, 16, �.
d is 6
n is 15
15th term = 4+[(15-1)*6] = 4+[14*6] = 4+[84] = 88

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