The correct answer is Choice D, 9.8.
The relationship in the above diagram is:Â
JH^2 = GJ(LJ)
All we have to do is plug in what we have and solve for the unknown.
49 = 5(5 + x)
49 = 25 + 5xÂ
24 = 5x
4.8 = x
Now, add the length of GJ and you have the total for LJ.
4.8 + 5 = 9.8