Evaluate algebraic expressions correctly using substitution and order of operations.
Evaluate a contextual expression
Problem
A ride-share company charges a total of \(3m~+~6~\text{dollars}\) for a trip, where \(m\) is the number of miles traveled. Find the total cost when \(m~=~8\).
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What this problem is really about
Interpret the rule before calculating: three is the per-mile charge, m is the miles traveled, and six is the fixed fee. Substitute the trip distance for m, multiply to find the mileage portion, and then add the one-time charge. The final value represents dollars, not miles.
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