arithmetic sequence
d = 5
an = a + 5(n-1)
eg a5 = 31 = a + 5*4 = a + 20
so
a = 11
so
an = 11 + 5(n-1) = 6 + 5 n
the last one
In a sequence of numbers, a3=21, a4=26, a5=31, a6=36, and a7=41.
Which equation can be used to find the nth term of the sequence, an?
an=7n
an=7n+21
an=5n+21
an=5n+6
2 answers
Find the first 4 numbers of the equation for the sequence: an=5n-21