Question

a=-18.9,d=2.5,an=3.6,n=? plz solve this. this in arthematic progression​

Answer 1

Answer:

n=1

Step-by-step explanation:

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Answer 2

an=a+(n-1)d

3.6=-18.9+(n-1)2.5

3.6 = -18.9 + 2.5n - 2.5

3.6 + 18.9 + 2.5 = 2.5n

25.0 = 2.5 n

25÷2.5 = n

1 = n

Step-by-step explanation:

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