Evaluate multi-step numerical expressions using order of operations, including grouping symbols and exponents.
Select the right model and evaluate it
Problem
A streaming service charges a \(\$12\) base fee and a \(\$4~\text{device}~\text{fee}~\text{each}~\text{month}\). A family buys \(3~\text{months}\). Model the total cost with an expression and evaluate it.
Both fees occur every month, so one month’s complete cost must include both of them. We’ll group the base fee and device fee, then multiply that monthly total by the number of months. This model counts each recurring charge once per month and avoids multiplying only one fee.
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