Question

the second and fifth terms of an arithmetic sequence are -2 and 7, respectively. find the first term and a recursive rule for the nth term

Answer 1

Explanation:

a2 = -2

a + d = -2

a + 6d = 7

-5d = -9

d = 9/5

a = -19/5

an = a + ( n-1 ) d

an = -19/5 + ( n-1 ) 9/5