What is
factorise:
4x squared -1
9x squared -64
49x squared -121
4x squared -y squared
9a squared -b squared
16a squared -9b squared
x squared -42 squared

me asap

The seventh-grade students at charleston middle school are choosing one girl and one boy for student council. their choices for girls are michaela (m), candice (c), and raven (r), and for boys, neil (n), barney (b), and ted (t). the sample space for the combined selection is represented in the table. complete the table and the sentence beneath it.