Which property can you apply to Hayley's expression to show that it is equivalent to Gretchens expression?

Distributive property of the multiplication.

Step-by-step explanation:

You did not post Gretchen's expression, but i gues that it is 3*(x + y)

I guess that it is the distributive property of the multiplication.

For 3 numbers, A, B and C, we have that:

A*(B + C) = A*B + A*C

here we have:

3*x + 3*y

We can do the inverse process to the distributive property, and get:

3*x + 3*y = 3*(x + y)

which i guess is Gretchen's expression.

go and ask your mom to you