Where can the perpendicular bisectors of the sides of a right triangle intersect

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

The lengths of two sides of a right triangle are given. find the length of the third side. round to the nearest tenth if necessary. a) y = 12/5x + 39/5 b) y = 5/12x + 5/39 c) y = 12/5x - 39/5 d) y = 5/12x - 5/39

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!