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A school plants \(5\) trees in its garden to start. Every year, they plant \(3\) new trees.
The total number of trees after \(n\) years is given by the formula:$$\begin{aligned}u_n &= \text{Initial number of trees} + \text{Nbr years} \times \text{Trees planted per year} \\ &= 5 + n \times 3 \\ &= 5 + 3n \\ \end{aligned}$$where \(u_n\) is the number of trees after \(n\) years. How many trees will there be after \(12\) years?
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