Can someone help me with this please

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.)

Acircle has a circumference of 7.850 units. what is its radius?

Determine if the equation defines y as a function of x: 2xy = 1. yes o no