Barb pulled the plug in her bathtub and it started to drain. The amount

of water in the bathtub as it drains is represented by the equation

L = −5t2 – 8t + 120, where L represents the number of liters of water

in the bathtub and t represents the amount of time, in minutes, since

the plug was pulled.

How many liters of water were in the bathtub when Barb pulled the

plug? Show your reasoning.

Determine, to the nearest tenth of a minute, the amount of time it takes

for all the water in the bathtub to drain.

of water in the bathtub as it drains is represented by the equation

L = −5t2 – 8t + 120, where L represents the number of liters of water

in the bathtub and t represents the amount of time, in minutes, since

the plug was pulled.

How many liters of water were in the bathtub when Barb pulled the

plug? Show your reasoning.

Determine, to the nearest tenth of a minute, the amount of time it takes

for all the water in the bathtub to drain.

## This question was asked on May 09, 2010.

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