Help pls. i dont understand

What is the average rate of change for this function for the interval from x=2 to x=4 ?

Identify the number 127 as a rational or irrational. explain

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)