Some one helppp meee ASAAAP

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Why do cells appear different in distilled water than they do in 10% salt water?

The yearly amounts of carbon emissions from cars in belgium are normally distributed with a mean of 13.9 gigagrams per year and a standard deviation of 5.8 gigagrams per year. find the probability that the amount of carbon emissions from cars in belgium for a randomly selected year are between 11.5 gigagrams and 14.0 gigagrams per year. a. 0.340 b. 0.660 c. 0.167 d. 0.397