Answer this please and if you have an app that can help me with this please tell!

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

Urgent? will give brainliest to the first correct answer what is the area of the figure?

Lines a and b are perpendicular. if the slope of line a is 3, what is the slope of line b?