Answer:
The given expressions x+3(7-x) and x+21-3x are equivalent by using the distributive property
Explanation:
Given expressions are x+3(7-x) and x+21-3x and also given that they are equivalent
To find for what property the given two expressions are equivalent :
x+3(7-x)=x+3(7)+3(-x)
=x+21-3x ( here we are using the distributive property a(x+y)=ax+ay )
Therefore the given expressions x+3(7-x) and x+21-3x are equivalent by using the distributive property