Answer:
The rule is "add 5, add 10, add 20" and the rule keeps doubling.
If you could post the picture I can help
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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