Need answer has soon has possible

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

Using inductive reasoning, what are the next two number in this set? 2,3/2,4/3,5/4,

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