(Simplify your answers. Type exact answers, using radicals as needed)

If 20% of a number is 35, what is 50% of that number?

Ten times the square of a non-zero number is eqaul to ninety times the number

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