Question

In problem 2, what rational number is a coefficient of a?

Answer 1

1

Explanation:

If you have nothing in front of a variable, then you know it is a 1.

If you have 10 people in 1 group, how many people do you have? 10. You could've just said you have 10 people. Just because it isn't there doesn't mean it doesn't exist. It is just easier not to say it.