Is the following a sequence arithmetic? if so, identify the common difference 4.1,3.8,3.5,3.

Yes, it is arithmetic.  The common difference is -0.3

Step-by-step explanation:

Sequences that are arithmetic have a common difference between terms.  To find the common difference, take the the second term, and subtract the first term. Check all other terms to make sure they follow the same pattern using the common difference you calculate.

In this example...

3.8 - 4.1 = -0.3

The common difference is -0.3.  

3.8 + (-0.3) = 3.5, which is the third term,

3.5 + (-0.3) = 3.2, which is the fourth term

This sequence is arithmetic with a common difference of -0.3

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