Pls be my gf pls I am lonely quarantine sucks

What’s the scientific notation for the number 6,840,000,000

Label a-f based on the table using c for concentrated and d for dilute

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