Question

What is the rate of change of the water level , in feet per hour

Answer 1

A; rate of change is the same as slope, so, using the slope formula,
`m= (y_(2) - y\1_(1) )/( x_(2) - x_(1) )`, where
`m` is the slope and
`x_(1)`,
`x_(2)`,
`y_(1)`, and
`y_(2)` are the
`x` and
`y` values.

Plug in
`2` points for
`x` and
`y`, water level being the
`y` and time being the
`x` since we're looking for the answer in ft/hr-- you can choose any two, but from the same row.


`m= ( 30-50)/(4-0)`

`m= (-20)/(4)`

`m= (-5)/(1)`

`m= -5` ft/hr