Use units to guide multi-step problem solving and choose/interpret units, scales, and graph origins.
Identify invalid operations with incompatible units
Problem
Audit the sum \(3~\text{meters}~+~4~\text{seconds}\). State its validity, identify \(\text{both}~\text{dimensions}\), assess their compatibility for addition, and describe any legitimate conversion remedy.
Big Picture
What this problem is really about
Classify the physical dimension of each term before doing arithmetic. Addition requires quantities that measure the same kind of thing, possibly after a conversion within that dimension; a conversion can change units of length or time, but it cannot turn one dimension into the other.
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