Answer:
8. x≤4
9. x≤-5 or x>3
10. x=10, 10 nights
11. x<160
Explanation:
8. 1<3x-2≤10
Add 2 on both sides
3<3x≤12
Then divide 3x on both sides
x≤4
9. closed circle means ≤ or ≥ open means <or> so x≤-5 or x>3 two separate lines mean or
10. 30+3x=40+2x
Subtract 30 on both sides
3x=10+2x
Subtract 2x on both sides
x=10, so it takes 10 nights
11. no more than 160 means x is less than 160
so x<160