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# Key features of graphs — Harder example

Watch Sal work through a harder Key features of graphs problem.

## Want to join the conversation?

• the question asks for rate of change of altitude, then why do we calculate rate of change of altitude over rate of change of time??
• because the answers is in altitude per second, so you have to know how many seconds passed.
• what kind of refrigerator was that? Did that guy bought it on wish or what, after 2 hours and the dish is at 40 degrees Fahrenheit, what?, I am joking
• lol
i was thinking the same thing
(1 vote)
• I get it how you got the answer, but why did you do altitude/time wouldn't that be y/x and in math you are suppose to do x/y so would it be 28/26 = 1.07692308, and then round to 1.08. So wouldn't the answer be the choice "B"?