I have n friends. Every night of the 365-day year I invite 4 of them to dinner. What is the smallest n could be such that it is still possible for me to make these invitations without ever inviting the same group of four friends?

Which of the angle pairs can be classified as vertical angles? ∠1 and ∠2 ∠2 and ∠4 ∠3 and ∠2 ∠4 and ∠1 ∠3 and ∠1

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 ?

Abox holds 500 paperclips. after a week on the teacher's desk 239 paperclips remained. how many paperclips were used?