If the replacement set is the set of real numbers, solve :

8 - 3x ≤ 20

For the following real number line, the solution set is :

1. {x : x ∈ W and -2 ≤ x < 4}

2. {x : x ∈ N and -2 ≤ x ≤ -4}

3. {x : x ∈ R and -2 < x ≤ 4}

4. {x : x ∈ R and -2 ≤ x < 4}

The solution set for the following number line is :

1. {x : x ∈ Z and -3 < x < 4}

2. {x : x ∈ Z and -3 ≤ x}

3. {x : x ∈ Z and -2 ≤ x ≤ 4}

4. {x : x ∈ Z and -3 ≤ x ≤ 4}