Which of the following is true about a parallelogram? The diagonals are equal.
The diagonals bisect each other.
All sides are congruent.
The diagonals are perpendicular.

Diagonals bisect each other

Step-by-step explanation:

Not all sides are congurent on a parallelogram, there are no right angles in a parallelogram because the diagonals don't intersect, and the diagonals are not always equal.

a = 4.762203156

Step-by-step explanation:

Given:

ab^4 = 12 and a^5b^5 = 7776

Making the equations a subject of a;

a = 12/b^4 and a^5 = 7776/b^5

Finding fifth root on both sides of equation two;

a = /b

You will get a = 6/b

Equating the two equations;

12/b^4 = 6/b

Multiplying both sides by b^4 gives:

b = = 1.25992105

We had that a = 12/b^4 so;

a = 12/1.25992105^4 = 12/2.5198421 = 4.762203156