Interpret complex expressions by treating meaningful sub-expressions as single units.
Interpret a sub-expression inside parentheses
Problem
In \(3(12+5)\), three people each pay \(\$12\) ticket plus \(\$5\) snack. For \(12+5\), identify role, scope, value/formula, and unit.
Big Picture
What this problem is really about
Parentheses define the exact scope of the requested subexpression. We’ll interpret each amount inside as part of one person’s cost, combine only those inside terms, and attach a per-person dollar unit to that subtotal. Keeping the outside factor separate prevents the one-person quantity from being mistaken for the grand total.
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