Angles relationships

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 t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.

What is the 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83