which of the following does (√r)^2 simplify to, for Amy nonnegative real number r? A 1 b r c √r d i^2

What is the number 321,000,000 in scientific notation? also what is the number? ?

Need same math paper but the back now i hope your able to read it cleary i need with hw

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