book Maths Puzzle Numerical Ability

Need help with the following:

Solve the inequality |3x - 1| < 7 and write the answer in the set notation.

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book Other Question

Please explain and solve the polynomial:

n to the second power/4 - 9/16 What is the area of a triangle if the sides are 2.6 ft.,3.4 ft., and 4.1 ft.