Respuesta :

Answer:

21) n= -13 so replace the n with -13. you do 18- -13 which is 31

22) 9.45

23)  -2.2

Answer:

21.   31.

22.  9.45

23.  -2 1/5.

Step-by-step explanation:

18 - (-13)

= 18 + 13

= 31.

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