Answer:
d = 8/7.
Step-by-step explanation:
Formula for the nth term an = a1 + (n - 1)d where a1 = the first term and d = the common difference.
Here we have:
a2 ( the second term) = a1 + (n - 1)d
= 8 + (2 -1 )d = d + 8.
In the same way we can show that the 10th term
a10 = 9d + 8.
But we are given that a10 = 2*a2 so:
9d + 8 = 2(d + 8)
9d + 8 = 2d + 16
7d = 8
d = 8/7.
