Answer please: Hector bought 45 tiles to make a patio. How many different ways can he arrange the tiles to make the patio? (plz answer and plz help)

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

Which recursive formula can be used to determine the total amount of money earned in any year based on the amount earned in the previous year? f(n+1)=f(n)+5

What is the prime factorization of 230