book Maths Puzzle Numerical Ability

could you please help me with this problem:

-8≤2x - 4≤8

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book Other Question

Simplify: 25a^4 - 25b^4 / 5a^4 - 5b^4 Suppose the number of students in a mathmatics class is X , the teacher insists that each student participate in group work each class. The number of possible groups is G = x^2 - 3