How do i do #27? using trigonometric ratios or inverse

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

For how answer my question this will be the last question can you answer in math subject

Simplify the expression. -2/5(10+15m-20n)