Can someone answer this 1/9÷4

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?

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

How do you write a paragraph proof to prove that the corresponding angles shown are congruent