HCl + CaCO3 CaCl2 + CO2 + H2O balance

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

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

What can a drop of liquid mercury be described as?