Respuesta :

Answer: 3x+5x and 8x, 3(x+4) and 3x+12, a+b+a and 2a+b


Step-by-step explanation:

3x+5x is equal to 8x, so they're equivalent


3(x+4) is also equal to 3x+12 when you use the distributive property


a+b+a is also equivalent 2a+b