Help me plz thanks. :)

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

Abiologist is recording the loss of fish in a pond. he notes the number of fish, f, in the pond on june 1. on july 1 there were 63 fish in the pond, which is 52 fewer fish than were in the pond on june 1. which equation represents this situation? a. f – 52 = 63 b. f – 63 = 52 c. 63 – f = 52 d. f – 63 = –52

The triangles are similar. what is the value of x? show your work.