Which expression is equivalent to 13 – (-21)?
2 answers:
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Answer:
= 10 - 3n
Step-by-step explanation:
the terms 7, 4, 1, - 2 form an arithmetic sequence with n th term
=
+ (n - 1)d
where d is the common difference and the first term
here d = - 2 - 1 = 1 - 4 = 4 - 7 = - 3 and = 7, hence
= 7 - 3(n - 1) = 7 - 3n + 3 = 10 - 3n