book Maths Puzzle Numerical Ability

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A local chicken farmer is constructing a set of eight pens to cage his chickens as shown in the diagram below. He has decided to use 1200 feet of fencing to create

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book Other Question

How do you find the domain and the range of funtions like this??
1){{{ (x-5) / (18-3x-x^2) }}}
or
2) {{{ 3sqrt( -3-x ) }}} The height of a triangle is 8 inches less than its base. The area of the triangle is 192 square inches. the height of the triangle is __ inches and the base of the triangle is __ inches.