Answer:
1. 240 cm³
2. 30 cm²
3. P = 2[(x²+2x-3) + (5x+4)]
4. 3x³ + 4x² - x + 8
5. x³ - 3x² + 12
Step-by-step explanation:
1. [ 2(3) - 3 ] x ( 3 + 5 ) x [ 3(3) + 1 ] = 240 cm³
2. A = (10 cm) (6 cm) / 2 = 30 cm²
3. P = 2(l + w)
P = 2[(x²+2x-3) + (5x+4)]
4. (3x³ + 7x² - 5) + (2x² + 3x + 8) = 3x³ + 9x² + 3
(3x³ + 9x² + 3) - (5x² + x - 5) = 3x³ + 4x² - x + 8
5. (4x³ + x² + 5) - (3x³ + 4x² - 7) = x³ - 3x² + 12
