3 years ago

The common difference of an arithmetic sequence is -5. If a12 is 22, what is a1?

Mathematics

1 answer:

Ne4ueva [31]3 years ago

4 0

Answer:

77.

Step-by-step explanation:

an = a1 + (n-1)d where d is the common difference.

a12 = a1 + 11d

22 = a1 +11(-5)

22 = a1 - 55

a1 = 22 + 55

a1 = 77.

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