Please this is due very soon please guys- GIVING 30 POINTS

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find 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