PLEASE HELP DONT SKIP :((

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.)

Name the most appropriate metric unit for each measurement

Iam a rectangle. my perimeter is 60 feet. how much are do i cover?