Need help 4-11. Max points

What is the standard form of -5x^2+2x^4-11+x^3+3x

Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us

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?