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

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

anonymous · Answer

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

cwrw238 · Answer

an arithmetic sequence is
a, a+d, a+2d, a + 3d  +...

where a = first term and d = common difference

cwrw238 · Answer

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

anonymous · Answer

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