book Maths Puzzle Numerical Ability

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 ) }}}

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book Other Question

Identify the shape of the graph, transform it into standard form, and sketch the graph.
y = (2/3)x^2 - 8x + 29
A bag contains 7 apples and 5 oranges. If you select 6 pieces of fruit without looking, how many ways can you get six apples?