2 is divided by the difference of a number and 3. how do i write it in a algebraic expression

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?

To decrease an amount by 16% what single multiplier would you use

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