How is comparing 645 and 738 is different from 645 and 649
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A; rate of change is the same as slope, so, using the slope formula, 
, where 
is the slope and 
, 
, 
, and 
are the 
and 
values.
Plug in
points for and , water level being the and time being the since we're looking for the answer in ft/hr-- you can choose any two, but from the same row.
ft/hr
Plug in
