How many 10-digit numbers can one write using only one “1” and nine “0”?

If 25% of y is 30, what is 60% of y?

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 ?

What is the slope of (0,32) and (100,212)