Can someone please help no one will answer :(

Multiply. −2x(6x4−7x2+x−5) express the answer in standard form. enter your answer in the box.

What is the measure of angle z in this figure? enter your answer in the box. z = ° two intersection lines. all four angles formed by the intersecting lines are labeled. clockwise, the angles are labeled 43 degrees, x degrees, y degrees, and z degrees.

In a column proof the right column states your reasons