Aprojectile is launched from the origin, according to a given reference, and travels the trajectory of a parable. the function that represents this parable is y = –x2 + 4x. what are the coordinates of the point at which this projectile reaches its maximum height?

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18

step-by-step explanation:

draw the shape and you will see that f and k are actually at adjacent vertices (points of the hexagon that are neighboring).   so find the distance between (1,2) and (4,2).   that is easy since (1,2) and (4,2) is just a vertical distance to count, which is 3.   it is a regular polygon which means all sides are congruent.   you have 6 sides (hexa) so multiply 6 by 3 to receive 18.