The resistance R (in $2) of a certain wire as a function of the temperature T (in C) is given by R = 18.0 + 0.400T + 0.0750T. Find the instantaneous rate of change of R with respect to T when T = 117C. The instantaneous rate of change of R with respect to T when T = 117C is | 2/c. (Type an integer or a decimal rounded to the nearest tenth as needed.)