I found the answer nevermind

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula c= r/1.8 - 273, what is the temperature in celcius corresponding to r degrees rankine.

This is about circle theorems. someone asap : (

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c