R-(-4x - (y + y)); use x = -4, and y = -3 evaluate ​

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

Tatiana reads 40 pages of her book every night for x number of nights. write an expression that shows the number of pages she has read

David leaves his house to go to school. he walks 200 meters west and 300 meters north. how far is david from his original starting point?