Answer:
I guess 36
Step-by-step explanation:
the answer should be x= -7 hope this helps!
21/4
4 1/2 is 9/2 is 18/4
18/4+3/4=21/4
17.4
side 1=4.5
side 2=4.5
side 3=4.5
base 1=3.9