To predict the outcome of the vote for the school board election, a candidate uses random number to pick 100 registered voters. She calls these voters and asks how they plan to vote. Cure s the sample taken in this problem representative of the population? Explain.

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.

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

What is the value of the discriminant, b2 ? 4ac, for the quadratic equation 0 = x2 ? 4x + 5, and what does it mean about the number of real solutions the equation has?