The number of cases of a new disease may be modeled by the quadratic regression equation y=-2x^2+40x+8. which of the following is the best prediction for the number of cases after 15 years?

we have been given that number of cases of a new disease can be modeled by the quadratic regression equation .

we need to estimate the number of cases after 15 years.

in order to do so, we will substitute x=15 in the given quadratic regression equation.

therefore, number of cases of a new disease after 15 years are 158.

option a.

step-by-step explanation:

if you look closely at the graph, we can notice that the function is not defined at two different points.

if you look at functions b and c, you will notice that both functions are not defined at just one point. the function b is not defined at x= -5/2 and function c is not defined at x=-5. both options are discarded, given that our function should not be defined at two fiferent points.

now, if you look closely at the graph you will notice that the function sketched is not defined at x=5 and x=-2.

step-by-step explanation: