Answer:
Step-by-step explanation:
In an arithmetic sequence, the consecutive terms differ by a common difference. The formula for determining the nth term of an arithmetic sequence is expressed as
Tn = a + (n - 1)d
Where
a represents the first term of the sequence.
d represents the common difference.
n represents the number of terms in the sequence.
From the information given,
a = - 5
d = 6
n = 21
We want to determine the value of the 21th term, thus, n = 21. Therefore,
T21 = - 5 + (21 - 1)6
T21 = - 5 + 120
T21 = 115
