1. Add. Use a horizontal format. (Simplify your answer completely.)

(7x + 5x³ 7) + (12x² 8x + 4)

2. (6r² 6r + 8) + (2r² 8r)

Add. Use a vertical format. (Simplify your answer completely.) 3.(x² + x + 5) + (2x² 11x + 5)

4. (8a³ 9a + 1) + (4a² 3a + 1)

Subtract. Use a horizontal format. (Simplify your answer completely.)

(6 7b + b²) (5b³ 6b 7)

(3x² + x 3) (x² + 4x 2)

3a³ 4a + 1) (a³ 4a + 4)

Subtract. Use a vertical format. (Simplify your answer completely.)

(5x² + 9x 9) (7x² 7x + 5)

(4 x 4x²) (4 + 9x x³)

Find the equation of the line that contains the given point and has the given slope.

P(6, 20), m = 4

P(7, 2), m = 5/7

P(4, 1), m =5/6