Line equations from point/slope

What is the value of r of the geometric series?

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)

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if