Answer:
Step-by-step explanation:
Thirty
5x - 4(3 + 2x) ≥ 9 Remove the brackets
5x - 12 - 8x ≥ 9
- 3x - 12 ≥ 9 Add 12 to both sides
-3x ≥ 9 + 12 Combine
-3x ≥ 21 Divide by - 3
x ≥ 21/-3 Whenever dividing by a minus, the plus minus is reversed.
x ≤ - 7
Thirty One
15x - 10 > 12x - 3 Subtract 12x from both sides
15x - 12x - 10 > 12x-12x -3 Combine
3x -10 > -3 Add 10 to both sides
3x > -3 + 10
3x > 7 Divide by 3. Don't reverse the >
x > 7/3
x > 2 1/3 or 2.33
Thirty Four
12x - 4 ≤ 20x - 20 Add 20 to both sides
12x - 4 + 20 ≤ 20x Combine
12x + 16 ≤ 20x Subtract 12x from both sides
16 ≤ 4x Divide by 4
16/4 ≤ 4x/4
4 ≤ x
