Natalie had some marbles. she gave 1/3 of them to her brother, who kept 12 marbles for himself and gave the rest to 5 friends. if each friend received 7 marbles, how many marbles did natalie have at firts?

answer: it's a

step-by-step explanation:

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.