Respuesta :

cbad0693

Answer:

x=4

Step-by-step explanation:

since its a square, the diagonals cut the right angle in half, so 45

6x - 21 = 45

6x = 24

x=4
(6x-21)
6x-21=0
6x=21
Divide both side by 6 to leave x alone,
x=3.5