All you have to do is isolate the variable. Ex: 1: add 15 to both sides and get n=6. (-9+15 is the same as 15-9 if that helps at all.) do you understand now?
Answer d; a supplementary angle = 180°, so if that angle = 150°, y would = 30°.
Another question on Mathematics
Mathematics, 21.06.2019 16:30
We have enough material to build a fence around a station that has a perimeter of 180 feet the width of the rectangular space must be 3 1/4 feet what must the length be