You can buy valentines in boxes of 10. Edward has 32 students in his class. How many will he have left after he buys enough for
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The depth of a river changes after a heavy rainstorm. Its depth, in feet, is modeled as a function of time, in hours
y is the depth in feet and x is the time in hours
From the table we can see that
In 9 hours, the depth is 18 feet
In 18 hours , the depth is 21 feet
(9,18 ) and (18,21)
Average rate of change =
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=
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the average rate of change for the depth of the river is feet per hour