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You start with \(\dollar 30\) and each week your parent gives you \(\dollar 10\).
The amount of money you have after \(n\) weeks is given by the formula:$$\begin{aligned}u_n &= \text{Initial Amount} + \text{Nbr weeks} \times \text{Amount received each week}\\ &= 30 + n \times 10\\ &= 30 + 10n\\ \end{aligned}$$where \(u_n\) is the amount after \(n\) weeks. How much money will you have after \(20\) weeks?
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