The vertices of square ABCD are A(−5, 0), B(−1, −2), C(−3, −6) and D(−7, −4). Which of the following shows that its diagonals are congruent perpendicular bisectors of each other? PLEASE HELP ASAP!

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days