Which property of polynomial multiplication says that the product of two polynomials is always a polynomial

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account

Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document