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olga55 [171]
4 years ago
6

In an AP with 18 terms the common difference is $-3$−3 . If the nth term is $-5$−5, what is its first term?

Mathematics
2 answers:
Zinaida [17]4 years ago
8 0

Answer:

a = 46

Step-by-step explanation:

Refer to the attachment.

erastova [34]4 years ago
5 0

Answer:

46

Step-by-step explanation:

The n th term of an AP  is

a_{n} = a₁ + (n - 1)d

where a₁ is the first term and d the common difference

Here d = - 3 and a_{18} = - 5 , thus

a₁ + (17 × - 3) = - 5

a₁ - 51 = - 5 ( add 51 to both sides )

a₁ = 46

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