Elizabeth, frank, gary, and helen are getting in line to buy lunch in the cafeteria. how many different ways could they line up so that helen is first in line?

Question and answers are in the attached picture. you so much in advance.

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

Anyone know? will mark brainliest if correct