One third of the students in the marching band sign up for the pep band. Then, five students changed their minds. If there are 31 students in the pep band ,how many students are in the marching band?

Measure of angles 31 (x+4) (3x+9) me

Sasha delivers newspapers to subscribers that live within a 4 block radius of her house. sasha's house is located at point (0, -1). points a, b, c, d, and e represent the houses of some of the subscribers to the newspaper. to which houses does sasha deliver newspapers?

How is this equation completed? i cannot find any examples in the book.