Problem

Interpret average rate \(-4~\text{percentage}\text{-}\text{points}~\text{per}~\text{minute}\) on \(2~\text{to}~7~\text{minutes}\). State the interval, signed rate and direction, per-minute meaning, and total charge change.

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Interval: 2 to 7 minutes. Rate: −4 percentage points. Direction: charge decreases. Per-unit meaning: minute division is omitted. Total change: −5 points.

Interval: 2 to 7 minutes. Rate: −4 percentage points for the whole interval. Direction: charge decreases. Per-unit meaning: no per-minute rate. Total change: −4 points.

Interval: 2 to 7 minutes. Rate: −4 percentage points/minute. Direction: charge decreases. Per-unit meaning: 4 points lower per minute on average. Total change: −20 points.

Interval: 2 to 7 minutes. Rate: +4 percentage points/minute. Direction: charge increases. Per-unit meaning: 4 points higher per minute on average. Total change: +20 points.

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Interpret average rate \(-4~\text{percentage}\text{-}\text{points}~\text{per}~\text{minute}\) on \(2~\text{to}~7~\text{minutes}\). State the interval, signed rate and direction, per-minute meaning, and total charge change.

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