Afinite arithmetic sequence has 12 terms. the last term is 100 and the common difference is 3. what is the first term

the first term is 67

Step-by-step explanation:

A finite arithmetic sequence has 12 terms. The last term Is 100 and the common difference is 3.

the formula for nth term is

Equation for 12th term is

a_12 is the last term, a1 is the first term and d is the common difference

a12= 100, d= 3

Subtract 33 from both sides

a_1= 67

So the first term is 67