Simon used 3 pears and 9 apples to make a fruit salad. what was the ratio of the number of pears to the number of apples in the fruit salad?

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.)

Can you me find the missing length. i attached an image.

I’m really confused and need your assist me with this question i’ve never been taught