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.
TEMPERATURE Room temperature ranges from 20Â°C to 25Â°C. TEMPERATURE Room temperature ranges from 20Â°C to 25Â°C. Find the range of room temperature in Â°F. Use the formula, F  32  1.8C, to convert from the Celsius scale to the Fahrenheit scale. Follow.est Answer: To convert from Celsius (C) to Fahrenheit (F) the formula is (1.8 x C) + 32 = F & C = (F - 32)/1.8 Therefore a room temperature of 20C = 68 F and a room temperature of 25 C = 77F. Source(s): Weather Expert. JR Â· 5 years ago.