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### This Is a Certified Answer

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Add the following polynomials.

(4a + 2d) + (3a + d)

Combine like terms.

Combine like terms.

(6k + 85g) + (3k -28g)

Combine like terms.

(15p - 3w) + (8p - 5w)

Combine like terms.

Combine like terms.

(4a + 2d) + (3a + d)

Combine like terms.

**= 7a + 3d**

(9x + 10xy) + (5x - 5xy)Combine like terms.

**= 14x + 5xy**

(6k + 85g) + (3k -28g)

Combine like terms.

**= 9k + 27g**

(15p - 3w) + (8p - 5w)

Combine like terms.

**= 23p - 8w**

(28h - 41) + (7h - 771)Combine like terms.

**= 35h - 812**

### This Is a Certified Answer

In subtracting polynomials, change the sign of each term of the subtrahend, then proceed to addition rule (combining like terms, considering the rule in addition of integers.

Note: I've changed the sign of each term of the the subtrahend.

1) 2a + b - 3c

5) 9ax - 4ay - 8az

(Note: Addition of polynomials was correctly answered above by the moderator)

Note: I've changed the sign of each term of the the subtrahend.

1) 2a + b - 3c

__-3a -2b -4c__**2) 5x + 2y -6z**

*-a -b -7c*__-7x + 2y -3z__

*-2x + 4y -9z***3) 7p - 3k + 4m**

__-8p + 4k + 2m__

*-p + k + 6m*__4) 5x - 7y + 4z__

__-2x + 8y - 2z__*3x + y + 2z*5) 9ax - 4ay - 8az

__-2ax + 5ay + 9az__*7ax + ay + az*

(Note: Addition of polynomials was correctly answered above by the moderator)