8 The length of a rectangular children's playground is 10 m more than its width. The width of the playground is \(x\) metres.
- The perimeter of the playground is greater than 64 m . Write down a linear inequality in \(x\).
- The area of the playground is less than \(299 \mathrm {~m} ^ { 2 }\). Show that \(( x - 13 ) ( x + 23 ) < 0\).
- By solving the inequalities in parts (i) and (ii), determine the set of possible values of \(x\).