This is algebraic expression

Mustafa contributes 11% of his $67,200 annual salary to his 401k plan. what is his pretax income

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

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?