Product timeline. 1  1982 â Diet Coke is introduced, becoming the largest-selling low-calorie soft drink in America. 2  1983 â Diet Coke is introduced in the UK. 3  1986 â Diet Cherry Coke is introduced in American markets. 4  1994 â Diet Coke changes logo. 5  1999 â Diet Cherry Coke changes logo. 6  2001 â Diet Coke with Lemon is introduced.
21Â°C = 69.8Â°F. Use the formula F = 9/5C + 32. To convert from Celsius to Fahrenheit, multiply the number by 9, divide by 5, and add 32. In this instance, 21 x 9 = 189 / 5 = 37.8 + 32 = 69.8. Therefore, 21 degrees Celsius is equal to 69.8 degrees Fahrenheit.se the formula F = 9/5C + 32. To convert from Celsius to Fahrenheit, multiply the number by 9, divide by 5, and add 32.
13 degrees Celsius is equal to 55.4 degrees  Fahrenheit.    To convert temperature in Celsius to Fahrenheit, multiply the  degrees Celsius by 9, divide the product by â¦ 5, then add 32.   13 x 9 = 117   117/5 = 23.4   23.4 + 32 = 55.4. + 129 others found this useful.Tammy Camp.  To convert temperature in Celsius to Fahrenheit, multiply the  degrees Celsius by 9, divide the product by â¦ 5, then add 32.    13 x 9 = 117   117/5 = 23.4   23.4 + 32 = 55.4. + 129 others found this useful. Tammy Camp.