Answer the questions below.
Note that a change can be an increase or a decrease.
For an increase, use a positive number.
For a decrease, use a negative number.
(a) A tram moved upward 3 meters per second for 21 seconds. What was the total change in the tram's elevation?
meters
(b) In a lab, a substance was cooled by \( 48^{\circ} \mathrm{C} \) over a period of 8 hours at a constant rate. What was the change in temperature each hour?
\( { }^{\circ} \mathrm{C} \)

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