A jar contains 40 balls numbered through 40. Three balls are removed without being returned to the jar, and the numbers are written down in order. How many sequences of numbers are possible?

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

When x = 3 and y = 5, by how much does the value of 3x2 – 2y exceed the value of 2x2 – 3y ?

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 ?