I’m not totally sure about the less and greater signs because I’m not sure you can graph using those signs but either way their are your line equations
The value of 4 is in the 10,000 place. :)
If she wants to make 130.00, she should sell 90 prints. She is charged at first so she starts at -$50.00. And I don’t understand the first question.

As we know, sum of interior angles of a triangle is 180°
that is ~
Hence, value of x is 9°