They look like two zeros, no matter how far or close. they are indispensable for some people, but useless for other people. what are they?

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.)

What could explain what happened when the time was equal to 120 minutes

Typically a point in a three dimensional cartesian coordinate system is represented by which of the following answers in the picture !