Answer:
D an = -7+3(n-1)
Explanation:
-7,-4,-1,2,5,.....
To find the common difference, take the second term and subtract the first
-4 - -7
-4+7 = 3
We are adding 3 each time
The explicit formula
an = a1+d(n-1) where a1 is the first term and d is the common difference
an = -7+3(n-1)