A biologist created the following graph to show the relationship between the temperature of water (x), in degrees Celsius, and the number of insect larvae (y) in the water:
graph of y equals minus 2 times the square of x plus 20 times x plus 400
What does the y-intercept of the graph represent?
There were 400 larvae at 0 degree Celsius.
There were no larvae at 400 degrees Celsius.
The original number of larvae in the water was 400.
The original temperature of the water was 400 degrees Celsius.

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so the graph looks like
|dw:1437510080095:dw|

i attached it

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