Which of the following statements must be true?

1foot = 12 inches; 1 yard = 3 feet

What is the measure of angle afe? 79 81 91 99

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula , what is the temperature in celsius corresponding to r degrees rankine? a. 9/5(c - 273) b. 9/5(c + 273) c. 5/9( c - 273) d. 5/9( c + 273)