Question 125761
1. x >= -7


2. 20n + 35 >= 3n + 16
17n >= 19
n >= 19/17


3. -15r-12 >= -3(4r + 3)
-15r - 12 >= -12r - 9
-3r >= 3
r <= -1


4. 30n + 42 >= 6(4n + 15)
30n + 42 >= 24n + 90
6n >= 48
n >= 8