When are the values of () positive, and when are they negative?

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.

If the value of cos330°is√3/2 then find cos 165°.

Select all of the following expressions that are equal to 2.5.