Students in Mr. Mackie's art class went outside to draw a rainbow, whichfollows a parabolic path and has the equation of y = -0.1 (x - 1)^2 + 6, where y and y are measured in centimeters. Graph the function. If the height of the rainbow is 6cm, how far away are the end points of the rainbow from one another?

(An explanation would also help a lot!)