In quadrilateral abcd, diagonals ac and bd bisect one another: what statement is used to prove that quadrilateral abcd is a parallelogram? answers 1)angles bad and adc are congruent. 2) corresponding angles bcd and cda are supplementary. 3)sides cd and da are congruent. 4)triangles bpa and dpc are congruent.

1) 1)Angles BAD and ADC are congruent - false the angles on the same side, the are supplementary , not congruent
2) Corresponding angles BCD and CDA are supplementary.  True, but it does not prove that that quadrilateral ABCD is a parallelogram
3)Sides CD and DA are congruent. false , they are connected to the same vertex
 4)Triangles BPA and DPC are congruent. - the answer

If you need an equation, it would be y=2x+8, y would be how long it grew, x being weeks.if you need how long he was asleep, it would be 4 weeks if he started with no beard, the equation would be x=8÷2if he did have a beard before hand, the equation would be 2w+x=8