Final answer:
The distributive property can be used to factor out the greatest common factor. The expression 60m - 40 can be factored as 20(3m - 2).
Step-by-step explanation:
The distributive property states that when you have an expression with a common factor and a subtraction operation, you can factor out the greatest common factor. In this case, we have the expression 60m - 40. The greatest common factor of 60m and 40 is 20, so we can factor out 20 from both terms:
20(3m - 2)
The expression 60m - 40 can be factored as 20(3m - 2).