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Set P = {X / A + 1 ≤ x ≤ 2A + 1}, Q {- 2 ≤ x ≤ 5} 1) If a = 3, find the set (cup) ∩ Q: 2) If P is a subset of Q, find the value range of real number a
（1）a=3;
P:4≤x≤7;
| cup = {x | x ≤ 4 or X ≥ 7};
∴（CuP）∩Q={x|-2≤x≤4};
(2) If P is a subset of Q
a+1≥-2;a≥-3;
2a+1≤5;2a≤4;a≤2;
The value range of a is - 3 ≤ a ≤ 2;
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