(a)A tram moved downward 20 meters in 4 seconds at a constant rate. What was the change in the tram's elevation each second? (b)In a lab, a substance was heated by 4 degrees Celcius each hour for 36 hours. What was the total change in temperature?

-12 > a

step-by-step explanation:

-11 > 1 + a

subtract 1 from each side

-11-1 > 1-1+a

-12 > a

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step-by-step explanation: