Help? I need the right answers.

Ill mark the brainliest if you me with the these three questions 7,8,9

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

Pepe and leo deposits money into their savings account at the end of the month the table shows the account balances. if there pattern of savings continue and neither earns interest nor withdraw any of the money , how will the balance compare after a very long time ?