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kykrilka [37]
3 years ago
6

The first term of an arithmetic sequence is-3 and the 15 term is 53. What is the common difference of the sequence?

Mathematics
1 answer:
Annette [7]3 years ago
6 0
a_2=a_1+d
a_3=a_2+d=a_1+2d
a_4=a_3+d=a_1+3d
...
a_{15}=a_1+14d

Since a_1=-3 and a_{15}=53, the common difference d is

53=-3+14d\implies d=4
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