Add subtract or multiplying these few polynomials?

Question

The possiable answer choices are written underneath each question

(2x3 + 3x2 - 5x + 10) + (x3 - 6x2 + 7x - 1)

3x2 − 3x2 + 2x + 9

3x3 − 3x2 + 2x + 9

3x3 − 3x + 2x + 9

4: (-4x2 + x - 12) + (x2 - 2x)

-3x2 - x - 12

-4x2 - x - 12

-3x2 - 12

5: (x3 + 4x2 - 2x + 5) - (3x3 - 3x2 + x - 2)

-2x3 + 7x2 - 3x

-2x3 - 3x + 7

-2x3 + 7x2 - 3x + 7

6: (6x3 - 8x2 + 2x) - (4x3 + 10x - 11)

2x3 - 8x2 - 8x + 11

2x3 - 8x2 + 11

2x2 - 8x2 - 18x + 11

Answer 1

the answer should be:

3x6+2x+6