If we add, 7xy + 5yz - 3zc, 4yz + 9zx - 4y and -3xz + 5x - 2xy, then the answer is:Question 10Answera.5xy + 10yz +3zx + 15x – 4yb.5xy + 9yz +3zx + 5x – 4yc.5xy – 9yz +3zx – 5x – 4yd.5xy + 10yz +3zx + 5x – 6y

To solve this problem, we need to combine like terms.

The like terms are:

• xy terms: 7xy and -2xy
• yz terms: 5yz and 4yz
• zx terms: -3zx and 9zx
• x terms: 5x
• y terms: -4y

Adding these up, we get:

• xy terms: 7xy - 2xy = 5xy
• yz terms: 5yz + 4yz = 9yz
• zx terms: -3zx + 9zx = 6zx
• x terms: 5x
• y terms: -4y

So, the answer is 5xy + 9yz + 6zx + 5x - 4y.

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