i have put this question up two times now... and it hasnt been answered both times, this is my 3rd ime reposting it, someone PLEASE help me

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50.