The height, h meters, of a falling object is related to the time, 1 seconds, the object has been falling by the formula h= -4.9t2 + d where d meters is the initial height of the object above
the ground. The Bankers Hall building in Calgary is 196m tall. Express the time an object takes to reach the ground from this height as an exact number of seconds.

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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