If the magnitude of vector u is ||u|| = 7.81 and its angle of direction is 129.81°, which graph represents vector -u?

There is a line with slope 1/a going through the point (a, a²). find the equation of the line perpendicular to this line at this point. (don’t let this problem intimidate you! solve the problem as you would if i’d given you specific values. just use variables instead.)

To prove that def ~ gfh by the sss similarity theorem using the information provided in the diagram, it would be enough additional information to know that

Sketch one cycle if the cosine function y=2cos2theta