Answer:

1. -y-2

2. -4x²+x

3. 4m²+3m-2

4. 14n³+4n-4

5. 11b²-b-8

Step-by-step explanation:

1.

(4y+2)+(-5y-4)

4y-5y+2-4

-y-2

2.

(-x²+8x)-(7x+3x²)

-x²+3x²+8x-7x

-4x²+ x

3.

(4m²+6m+3)-(3m+5)

4m²+6m-3m+3-5

4m²+3m-2

4.

(8n³+5n-7)+(6n³-n+3)

8n³+6n³+5n-n-7+3

14n³+4n-4

5.

(7b²-3b-5)-(-2b-4b²+3)

7b²+4b²-3b+2b-5-3

11b²-b-8

hope it help.