Question

Find the 8th term of the arithmetic sequence.
a1 = 20, d = 5

Answer 1

55

Explanation:

arithmetic sequence equation:
`u_n=a+(n-1)d`

Therefore,
`u_n=20+5(n-1)`

So the 8th term is when n = 8:
`u_n=20+5(8-1)=55`