Question

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 peak of the graph represent?

The number of larvae is greatest at 450 degrees Celsius.
The number of larvae is greatest at 5 degrees Celsius.
The least number of larvae in the water is 450.
The least number of larvae in the water is 5.

Answer 1

Plz help fan and medal!

Answer 2

y = -2x^2 + 20x + 400
y = -2(x^2 - 10x) + 400
y = -2(x^2 - 10x + 25) + 400 + 50
y = -2(x - 5)^2 + 450

The peak occurs at x = 5 so the answer is B.

Answer 3

thanks

Answer 4

Anytime