If you make an electromagnet using a battery circuit and a steel nail, how can you increase its magnetic strength? a. replace the nail with a copper rod b. wrap more coils of wire around the nail c. use a longer nail d. remove the plastic insulation from the wire coil

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