Use δabc shown below to answer the question that follows: triangle abc with segment ad drawn from vertex a and intersecting side bc. which of the following must be given to prove that δabc is similar to δdba? a. segment ad is an altitude of δabc. b. segment cb is a hypotenuse. c. segment ca is shorter than segment ba. d. angle c is congruent to itself.

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