Find the nth term of this number sequence
15, 12, 9, 6

You only have four terms so n can only be 1, 2, 3 or 4!

I think you mean: What is the nth term of the sequence 15, 12, 9, 6, …?

The ellipsis (…) tells us that the sequence continues.

This is an arithmetic sequence, where the general term is:  a+bn  

n=1:a+b=15  [Eq. 1]

n=2:a+2b=12  [Eq. 2]

Subtracting Eq. 1 from Eq.2:  b=−3  

Substituting this into Eq. 1:  a−3=15⇒a=18

Thus the nth term is:  18−3n

Step-by-step explanation:

HOPE THIS HELPS

what is the question? i am guessing you are looking for the area.

to find an area, you have to do length x width.

in this case, it would be 12 ft x 4 ft = 48 sq. ft