PDF chapter test TRY NOW

Evaluate the following conditions and state true or false
 
i) 24\(+\)(18 \(+\) 26) \(=\) (24 \(+\) 18)\(+\)26
 
ii) 11\(-\)(18\(-\)26) \(=\) (11\(-\)18)\(-\)26 
 
iii) 24 \(+\) (\(-\) 24) \(= 0\)
 
iv) 11 \(+ 0 = 0\)