If somebody can help me on these 2 questions itd mean a lot i’ll mark you brainliest

Can someone me with my hwplz(only the circled ones)

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?

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.