39 is A
40 is D
And that is my answer
1/3, 2/4, 1/5, 9/3, etc....
Given:
The function is:

To find:
The value of
.
Solution:
We have,

Putting
, we get



On combining like terms, we get


Therefore, the required function is
.
D. <span>4(x) represents the total length of all four coffee table legs.</span>