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thawkins79
27.09.2019 •
Mathematics
The first four terms in an arithmetic sequence are -3, -10, -17, and -24. which expression can be used to find the nth term ? what is the 25th term of the sequence?
a) -7(n - 1); -168
b) -3 + (n - ); -171
c) -3 + (n + ); -185
d) 3 + (n - ); -165
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Ответ:
the nth term is : An = A1 +(n-1)d d :common difference A1: the first term
d=(-24)-(-17) = (-17)- (-10) = (-10) -(-3) =-7 and A1 = -3
An = -3 +(n-1)(-7)(B) -3 + (n - 1)(-7))
A25=-3+(25-1)(-7)=-3-168 = -171
Ответ: