Can someone solve the system of equations below

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u

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 ?

Find the unit rate. enter your answer as a mixed number. a fertilizer covers 2/3 square foot in 1/2 hour.