The problem is attached to the post
I really dont know how to turn that into a graph
to a):
Use the definition of Cosine:
to b):
If P = L then
to c)
If x = 0 then d = w
if then
Therefore
to d)
I'll leave this part for you.
to e):
That depends on how fast the life-guard is able to run or to swim.
Maxiumum way to run = 3w
Maximum way to swim =
Let denote the running speed and the swimming speed then the lifeguard will swim if