What is the simplified form of 3.2g^2+5.7d-2.7d+5.7g^2-4.2d

You would want to start by putting like terms together. 
3.2g² + 5.7g² + 5.7d - 2.7d - 4.2d
Now just simplify the terms
3.2g² + 5.7g² = 8.9g²
5.7d - 2.7d - 4.2d = 3d - 4.2d = -1.2d
Now you are left with 8.9g² - 1.2d which cant be simplified more.

I think the answer is:
8.9g^2-1.2d
I hope this helps!

Depends by how many apples are in a case