Collin states that 8 + (16 + 9) = (8 + 16) + 9 is always true. Which of the following properties would prove Collin is correct?

Part a: solve –mk – 120 > 95 for m. show your work. (4 points) part b: solve 2c – 9f = 45 for f. show your work. (6 points)

(40 points) i need some . an answer definition is appreciated as well.

The coordinates r(1, -3), s(3, -1) t(5, -7) form what type of polygon? a right triangle an acute triangle an equilateral triangle an obtuse triangle