Sagot :
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! :)
The answer is 17 because
(+) + (+) = +
(-) + (+) = -
(-)+(-)=+
(+)+(-)=-
13-(-4)= 13+4=17
(+) + (+) = +
(-) + (+) = -
(-)+(-)=+
(+)+(-)=-
13-(-4)= 13+4=17