If the blue radius below is perpendicular to the green chord and the segment is 8.7 units long, what is the length of the chord?

If 1/2 of that bisected chord is 8.7 units long, then the length of the whole chord is 8.7 + 8.7 which is 17.4 units. If a radius is perpendicular to a chord, then the radius bisects the chord, creating 2 equal length segments.

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.