A water tank contains 12 1/2 liters of water. Two- fifth of it was consumed. How much of it was left?​

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9

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

Find the rate of change for the situation.you run 7 miles in one hour and 21 miles in three hours.