Does anyone know the next number in this pattern?? 125,-25,5,-1

Empty box + box + empty box fill in the box is equal to 30 how

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?

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?