Aman has nine shirts and two ties. assuming that they all match, how many different shirt-and-tie combinations can he wear?

3382-299=3383- ? fill in the blank?

Find the nonpermissible replacement for binthis expression. b2/5b +5

Aladder that is 20ft long is leaning against the side of a building. if the angle formed between the ladder and the ground is 75 degrees how far is the bottom of the from the base of the building?