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Indicated operation.. This is a term in mathematics which is similar to "given operation". This automatically makes the students know what operation in a specific equation will be used. Commonly, this is usually visualised to a command "do the indicated operation"... For example: 15 + 15 = n Indicated operation: addition Supposed command: to add fifteen to fifteen... Hope this can help you! :)
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The answer is 17 because 
(+) + (+) = +
(-) + (+) = -
13-(-4)= 13+4=17
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