Question

The explicit formula for the nth term of an arithmetic sequence is an = a1 + (n - 1) • d. What is the simple formula corresponding to the explicit formula if the first term of the sequence is -10 and the difference between terms in the sequence is 5?

A. 5n - 5
B. 5n - 10
C. 5n + 15
D. 5n + 10
E. 5n - 15

Answer 1

put a1=-10 and d=5

Answer 2

5n-10

Answer 3

-10+(n-1)5
=-10+5n-5
=5n-15

Answer 4

ty