The first Arthmatic sequence is 23 and the 12th term is 72.

Question

Determine the first three terms in the sequence and the nth term and also Determine the Value of 10th term

Answer 1

I will assume you meant to say:
The first term of an arithmetic sequence is 23 and the 12th term is 72.

So a = 23 , and a+11d = 72
23+11d = 72
11d = 49
d = 49/11

take over, all you have to do is use the formulas