The accompanying data represent the percentages of teenagers in various countries that have used certain drugs. Complete parts (a) through (c) below. Country A B C D E F G H J K Drug 1, x 21 18 40 5 38 18 22 5 8 53 35 Other Drugs, y 4 3 20 2 15 9 13 2 3 31 23 a. Determine the correlation coefficient between the percentage of teenagers who have used Drug 1 and the percentage who have used other drugs. r= (Round to two decimal places as needed.) b. Find the equation of the regression line for the percentage of teenagers who have used Drug 1 and the percentage who have used other drugs. y =x + () (Round to two decimal places as needed.) c. What percentage of teenagers can be anticipated to use illegal drugs other than Drug 1 in a country where 10% of teenagers have used Drug 1? % (Round to the nearest whole number as needed.)