D. Solve the following problems involving addition of polynomials. Show your solution. 2. Give the total of 4a - 3b + 2c, 5a + 8b - 10c and -12a + c.

3. Add 13x4 - 20x + 5x - 10 and -10x2 - 8x4 - 15x + 10

4. Three polynomials are to be added: 4x2 + 2x, 9x² + 3x + 4 and x2 - 4. What is the single polynomial
that can represent them?

5. The lengths of A is 3x + 5 (m), that of B is 4x - 1 (m) and C is 2x + 9 (m). Find the sum of these
lengths​