Question

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

ANSWERS: 1.5, 1.2, A: an = 1.2 + (n – 1)1.5

Answer 1

The common difference is 1.5

Use the explicit formula to find a1.

a1 = 1.2

What is the explicit formula for the arithmetic sequence?

= 1.2 + (n - 1)1.5

Explanation: