What is the main purpose of scientific models?
a.
the main purpose of models is to have a physical object to which to refer.
b.
the main purpose of models is to represent observations.
c.
the main purpose of models is to study systems that no longer exist.
d.
the main purpose of models is to gain a better understanding of the world.

The answer is B. Scitifncic models are particularly significant to predict outcomes in cases where it would NOT be viable to hold experiments or treatments to get an outcome. These models use data and logical deduction to simulate certain factors and postulate an outcome based on an input. While these models are hypothetical, they are based  on proven scientific facts and can be close to predicting the natural phenomenon.  

complete the square on the right side of the equation;

-5(x + 0)^2 + 15

answer: d. y = -x^2 + 15

telophase and anaphase