bert decided to start exercising. the first day he jogged for 20 minutes. the next day he wanted to jog for 3 minutes more than the pervious day. he wanted to continue increasing by the same amount like this for every one of the 30 days in april. write a recursive definition of the time (tn+1) he jogged for on one day compared to the time of the previous day (tn).

a. tn+1=3+tn
b. tn+1=3*tn
c. tn+1=20+3*tn
d. tn+1=20+(3+tn)