Phép biến đổi tuyến tính xác định bởi có hạng bằng:
A. 0 B. 1 C. 2 D. 3.
f (x y z)= (x+y-z, x-3y+z, x-y)

Samantha is growing a garden in her back yard. she spend $90 setting up the garden bed and buying the proper garden supplies. in addition, each seed she plants cost $0.25. a. write the function f(x) that represents samantha's total cost on her garden. b. explain what x represents. c. explain what f(x) represents. d. if samantha plants 55 seeds, how much did she spend in total?