Problem

A bike rental costs $\$6~\text{per}~\text{hour}$ plus a $\text{one}\text{-}\text{time}$ $\$4$ helmet fee. Jada rents for $5~\text{hours}$ and separately buys a $\$3$ water bottle. Model and calculate the bike-rental cost, excluding unrelated purchases.

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What this problem is really about

Model only charges belonging to the bike rental. The hourly rate repeats for every rental hour, while the helmet fee is added once, so calculate those two parts according to their different roles. The water bottle is a separate purchase and must remain outside the rental-cost total.

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Multiplication with an added fee; 6 × 5 + 4 = 34, so the bike-rental cost is $34.

Repeated addition; 6 + 6 + 6 + 6 + 6 = 30, so the bike-rental cost is $30.

Multiplication with an added fee; 6 × 5 + 4 × 5 = 50, so the bike-rental cost is $50.

Multiplication with an added fee; 6 × 5 + 4 + 3 = 37, so the bike-rental cost is $37.

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A bike rental costs \(\$6~\text{per}~\text{hour}\) plus a \(\text{one}\text{-}\text{time}\) \(\$4\) helmet fee. Jada rents for \(5~\text{hours}\) and separately buys a \(\$3\) water bottle. Model and calculate the bike-rental cost, excluding unrelated purchases.

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