Sam and Sara have taken their math textbooks to the top of a twelve-story building and look at the pool which is 160 straight below them. Sam just lets go of his book, while Sara throws her book down with an initial velocity of 48 feet per second. How many seconds does it take each book to hit the water?

What is the standard form of -5x^2+2x^4-11+x^3+3x

Is trapezoid abdc the result of a dilation of trapezoid mnpq by a scale factor of ? why or why not? yes, because ab and cd are each the lengths mn and qp. yes, because sides ab and cd are parallel to sides mn and qp. no, because ab is the length mn but cd is the length qp. no, because sides ab and cd have different slopes from sides mn and qp.

Tom can paint the fence in 12 hours, but if he works together with a friend they can finish the job in 8 hours. how long would it take for his friend to paint this fence alone?