On a basic parallelogram, opposite sides are parallel, diagonals bisect each other and, consecutive angles are supplementary. However on a parallelogram diagonals aren't congruent.
So the answer is D
24 is 40% of 60
first you do 24/4=6 and 40%/4=10%
then 6*10=60 and 10%*10=100%
*=times
<span>(2x+2va)(x+3va)
= 2x^2 + 6axv + 2axv + 6a^2v^2
= 2x^2 +8axv + 6 a^2v^2</span>