The seventh term of an arithmetic sequence is 10.2 and the twelfth term is 17.7. What is the common difference of the arithmetic sequence?
The common difference is ______
Use the explicit formula to find a1.
a1 = _______
What is the explicit formula for the arithmetic sequence?
A: an = 1.2 + (n - 1)1.5
B: an = 1.5 + (n – 1)1.2
C: an = 1.5 + (n – 1)3.9
D: an = 3.9 + (n – 1)1.5
