Asking this question for a second time hoping someone sees it, I'm in desperate need of help and will mark brainliest!! please show the steps as well

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.)

9/10 divide by -3/15 as a mixed number

In a tutoring session, 2/3 of an hour was spent reviewing math problems. adelina attended 3/4 of the tutoring session. how much time did adelina spend at the tutoring session?