Earth weight is 5.9736 x 10^24 kg and venus is 4.8685 x 10^24 kg. what is the combined weight of earth and venus ?
a)10.8421 x 10^26 kg b)10.8421 x 10^23 kg c)10.8421 x 10^25 kg d)1.08421 x 10^25 kg

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