I think it might be 50? unless you meant 2/100, which is 0.02
We have that
<span>Bisector theorem--------------- >(LM)/(LN)=(OM)/(ON)
therefore
</span>(18)/(10)=(x)/(4)------------------ > x=7.2
the answer is x=7.2
D is the answer for this question:))

The formula of the sum of the arithmetic sequence:

calculate:

substitute

Your answer is: