How do I find the inverse and it’s relationship to the f(x) function?

Please help!!

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.)

In triangle opq right angled at p op=7cm,oq-pq=1 determine the values of sinq and cosq

Which equation represents the function on the graph?