Quadrilateral BCDE is a rhombus. What is DE?
D
с
9z
E
2+72
B

DE = 81

Step-by-step explanation:

The sides of a rhombus are congruent , thus

9z = z + 72 ( subtract z from both sides )

8z = 72 ( divide both sides by 8 )

z = 9

Then

BC = 9z = 9 × 9 = 81

Since the sides are congruent, then DE = 81

Step-by-step explanation:

5[2p-4(p+5)]=25

or, 2p-4(p+5)=5

or, 2p-4p-20=5

or, -2p=5+20

or, -2p=25

or, 2p=-25

or, p=25/2

so, p=12.5