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The model shows the expression 21 + 9. A model with 3 rows of 7 squares and 3 rows of 3 squares. Which expression is equivalent to this sum? 3 (7 + 3) 3 (7) + 3 3 + 7 + 3 7 (3 + 3)

Respuesta :

Answer: the answer is 3(7+3)

Step-by-step explanation: since 7+3 is in paranthases you add them first to get 10 and you multiply it by the 3 to get 30. We know its correct because 21+9=30.

Tarynriehle

Answer:the awnser is 3(7+3 ) Step-by-step explanation: I took the quiz today hope u get it right!

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