Solve this:
7. Find AB. 
     

were u able to take out AC coz in ?AEC there will not be ASP... So, CD=10+ BD=30 = 40.. (till now)

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Please find this answer

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tan 450=CF/AC
1=20/AC
AC=20
tan 600=DE/BD
root 3=30/BD
BD=10 root 3
draw GF perpendicular to DE such that GE=30-20=10 and CFGD is a rectangle
In triangle FGE,
tan 600=GF/GE
root 3=GF/10
GF=10 root 3
So, CD=10 root 3
Hence AB=10 root 3+10 root 3+20
=20+20 root 3
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54.64

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