First we need to find the value of x
Remember that the sum of the interior angles of a triangle must be 180
(9x+3) +(5x-2)+(11x-21)=180
25 x - 20 = 180
x=8
the angle E =9(8)+3=75
the angle F= 11(8)-21=67
the angle D= 5(8)-2=38
the shortest side is EF
the longest side is DF
DF > DE >EF
the statements that are true are
d and e