How do you complete the statement for the arithmetic sequence: 124 is the __ term of -2, 5, 12,...?

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Answer 1 · 2016-11-10T14:28:30

#124# is the 19th term of -2, 5, 12....

The nth term of an arithmetic sequence is given by #t_n = a + (n - 1)d#. Here, we have that #a= -2#, #d = 7#, #t_n = 124# and #n = ?#

#t_n = a + (n - 1)d#.

#124 = -2 + (n - 1)7#

#124 = -2 + 7n - 7#

#133 = 7n#

#133/7 = (7n)/7#

#n = 19#

Hopefully this helps!