Im having trouble with this question, could you help me factories this?

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?

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

Cody ran nine miles on his first day of training. the next day he ran 1/8 that distance. how far did he run the second day?