Can someone pls help?

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Ab based on the given diagram, if m_1 = 60° then m 2 = 30 60 90 180

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?