Answer:
5.5
Step-by-step explanation:
385 divided by 70=5.5
(3w^4-8w^2z^2+4z^4)-(5w^4+7w^2z^2-8z^4)
=3w^4-8w^2z^2+4z^4-5w^4-7w^2z^2+8z^4
=(3-5)w^4+(-8-7)w^2z^2+(4+8)z^4
so she made mistake in step 2.
1. 22.5
2. 2.4
3. 0.8
4. 14
5. 27.9...
6. 6
Hope this helps!
