A, it’s the move for that wuestion
Pythagorean theorem you times 40 by 2 then 9 by 2 then square root
F(x)=x-3 I think but I am not sure
First subtract h from h to get - 2h
Then add 19 to both sides leaving you with
-2h = -32
Then divide by -2 on both sides
H = 16