Factor -28x2-12x , you all for me answer these questions.

What is the volume of this square pyramid?

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?

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 ?