Adding and subtracting polynomials

Solve:

(5x^2 -8x^2 +8x) + (2x^2 +5x +10 +2x^2)

• -x^2 +13x +10

• 6xy^2 -2x^2 -xy -2x -y -1

• x^2 +13x +10

• None of the above

Find the sum.
(3y² + y³ - 5) + (4y² - y + 2y³ + 8)

• 3y³ + 7y² - y + 3
• 4y² + 3y³ - y + 3
• -y⁴ + 2y³ -y - 4
• 4y³ + 3y² -3y + 1

Simplify:

(2x + 5y - z) + (-6x - 4y + 7z)

• -4x +6y + 6z

• 4x + y + 6z

• -4x - y + 6z

• -4x + y + 6z

Mathematical Equivalence

OFF

Find the sum:

(3x + 5) + (2x + 3)

• 6x + 15

• 6x + 8

• 5x + 8

• 5x + 15

Add the following polynomials: 
(6x + 4x⁴ - 3x²) + (7x⁴ + 5x² + 8x)

• 11x⁴  + 2x² + 14x
• 16x⁴  + x² + 14x
• 11x⁴  + x² + 14x
• 11x⁴  + 2x² + 10x

Which expression represents the perimeter of the triangle?

• 11x+4

• 4x+4

• 10x-4

• 11x-12

What is the sum of (3x+8z) and (x+z)

• 2x+7z

• 4x+9z

• 3x+3z+8z

• 11x+4z