Respuesta :

Answer:

A=12

Step-by-step explanation:

A= 31 - B - C (Basic equation given to us)

then you sub in for the equation shown above

A= 31 - 4 - 15

then you can solve based on simple subtraction

A=12

cgummyy

Answer:

a=12

Step-by-step explanation:

a=31-4-15

13-4=27

27-5=12

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