3 years ago

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

1 answer:

4 0

Answer:

c = 4

Step-by-step explanation:

Let the common difference be c. Then a(n) = -3 + c(n-1). Since a(15) = 53, a(15) = -3 + (15-1)c = 53. Therefore, -3 + 14c = 53, or 14c = 56; c = 4.

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