Hi why is hpn3 =270 degrees?

Good evening Annela! Because P is due east of H, N1HP= 90 degrees.

This means that normal angle HPN3 is 180 - N1HP = 180 - 90 = 90, since both “norths” N1 and N3 are parallel to each other.

Then, reflex HPN3 = 360 - normal HPN3 = 360 - 90 = 270.

I will look at the rest later because I am on the move the whole day with students and other things.

The graph questions I will look at it again today but at a very late time, but I will need to find my own graph papers first; alternatively you can use Desmos online graphing calculator or data points plotter (for best fit curves and lines, suitable for linear law as well) to attempt the graph questions.