a=-18.9,d=2.5,an=3.6,n=? plz solve this. this in arthematic progression
Answers
Answered by
0
Answer:
n=1
Step-by-step explanation:
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Answered by
1
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:
hope it helps
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