Graceforconnexusgo Graceforconnexusgo Mathematics Answered Consider parallelogram ABCD. If AC¯¯¯¯¯¯¯¯=2x+15 and BD¯¯¯¯¯¯¯¯=5x−12, what does the value of x need to be so that the parallelogram is a rectangle? A: 1 B: -9 C: 9 D: 3/7