I'm sorry no one can answer and where is the question?
Please put in the question and I might be able to help!
to get the inverse of any expression, we start off by doing a quick switcheroo on the variables and then solve for "y".

I'm ASSUMING this is a 45-45-90 right triangle and that DF is the hypotenuse.
With that said. Angle F = 45 means that angle = 45 and angle E = 90 degrees.
There is only one rule for 45-45-90 right triangles:
hypotenuse = √(2) * leg
Given the hyp = 16
16 = √(2) * leg
divide both sides by √(2)
16/√(2) = leg
Rationalize the denominator
16√(2)/(√(2)*√(2) =
(16√(2)) / 2 =
8√2
You could use a 25 pound bag of rolled oats 7 times