M and n are integers. Select all the statements that are true if m and n are equal to each other M-n=n-m
0=m-n
M+(-n)=m-n
M+N=0

Is this a polynomial function? i need to know asap

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?

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m