Answer:
-4/13
Step-by-step explanation:
Answer:
A
Step-by-step explanation:
Joint variation is given by:

Where k is some constant.
We are given that y = 360 when x = 4 and z = 10. Therefore:

Solving for k:

Therefore, our equation is:

Then when x = 5 and z = 12:

The answer is A.
Reggie earns $480.70 a week before taxes are taken out.
She would save $9.12 by using the better sale! I hope this helped!:)