Question is on a picture

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?

Select all the expressions that will include a remainder.

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6