exam Maths Puzzle Numerical Ability

The perimeter of a rectangle is 420 inches. The width is 4 inches less than the length. What is the length of the rectangle?

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Can anyone help me? I am having trouble working this problem out. Any help would be appreciated.

Solve the inequality (x+3)(x+1)(x-5)<0 and write the solution set both in interv
The 4th root of 3s^2t^4 (numerator)
10,000 (denominator)

Please help! I don't get this root stuff!