The first term of an ap is -7 and the common difference is 5 find its 18th term
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Answered by
8
a= -7
d= 5
Tń = a+(n-1)d
T18 = -7+17*5
= -7+85
=78
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Answered by
1
Step-by-step explanation:
a= -7
d=5
an=18
an= a+ (n-1)d
18 = -7+(n-1)
18 +7 =(n-1)5
25. = (n-1)5
5. =n-1
n=6
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