When a cannonball is fired, the equation of its pathway can be modeled by h = -16t 2+ 128t. a. Find the maximum height of the cannonball.

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.