6800 dollars is placed in an account with an annual interest rate of 9%. To the
nearest year, how long will it take for the account value to reach 52000 dollars?

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.

      2

  2 is to go somewhat to the top right of a because it is squared    

v= a h/3