Respuesta :

Answer:

the answer would be 3a + a = 4a

Explanation:

because if a is alone that means it is a variable with a one and since there are to of the same variables, that means that we are allowed to add them so it would be like normal addition but with the variable of a so, 3a + 1a = 4a

Answer:

4a

Explanation:

when there is a letter without number there will always be an invisible number that is 1 so its the same as saying 3a+1a so u just add and that is it

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