21-25 is -4. Is this helpful?
When a population or group of something is declining, and the amount that decreases is proportional to the size of the population.
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Answer:
Parabolas are frequently used in physics and engineering for things such as the design of automobile headlight reflectors and the paths of ballistic missiles. Parabolas are frequently encountered as graphs of quadratic functions.
Y is the independent variables
k is the dependent variable
