Help me please! I’ve been stuck on this forever:(

What is the number 321,000,000 in scientific notation? also what is the number? ?

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?

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?