Question

The 12th term of an arithmetic sequence is 36, and the common difference is 3. What is the first term of the sequence?




A.

1


B.

2


C.

3


D.

4

Answer 1

nth term is given as\[a_{n} = a + (n-1)d\]
where a = first term , n = no. of terms, d = common difference

Answer 2

an arithmetic sequence is
a, a+d, a+2d, a + 3d +...

where a = first term and d = common difference

Answer 3

so the 12th term = a + 11d and this = 36
giving a + 11*3 = 36

find a

Answer 4

ok I got it thanks CWRW & your pic <3 lol