book Maths Puzzle Numerical Ability

simplify the rational expression

9x - 21
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15x - 35

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book Other Question

Here is my first problem:

The Scott Paper Company wishes to make a closed rectangular box that uses 173 square inches of material. If the base must have a length that is 2.1 tim Domain and Range for [(4,6),(6,7),(4,3),(5,19),(5,7)]