What are the vertex and x intercepts of the graph of y=(x-4)(x+2)? Select one answer for the vertex and one answer for the x intercept.

A x intercepts (-4,0)(2,0)
B vertex (1,9)
C vertex (1,-9)
D x intercepts (4,0)(-2,0)
E vertex (-1,-5)
F x intercepts (-4,0)(-2,0)

Ur environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 4.04.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 2525 samples is 4.44.4 ppm with a standard deviation of 0.80.8. assume the population is normally distributed. a level of significance of 0.020.02 will be used. make the decision to reject or fail to reject the null hypothesis. answer tables