The answer is A.) 21x/^3y
Here is proof
The <em>average</em> rate of change doesn't require calculus.
It's just
(amount of change during some time) / (amount of time for the change) .
You need calculus when you want the <em>instantaneous</em> rate of change . . .
that's the rate of change at a single point in time.
Yup and why would it be hard do it backward as multiplication
Answer:
2(18a-6y)
Step-by-step explanation: