No because the triangle’s angle is less than 90 degrees if it was a right angle triangle it would have a square marking the angle.
Its because when you fold the paper its makes it half so thats why it would be like that.
You would multiply the growth rate (.009) by 2/3 to get the percent rate per year. Therefore, the answer is .006
Re-written, I believe the equation is:
(W+23)+5=W+(23+5)
With this, the parenthesis have nothing multiplying into it, so we can drop the parenthesis to get:
W+23+5=W+23+5
Which is the same thing.
So I'd assume it is the Associative property, because you are combining the like terms of 23 and 5.
Hope this helps!