<span>5y-{11y+[-(-7y-15)]}
</span>= 5y-(11y+7y+15)
= 5y-(18y+15)
= -13y+15
HINT: The sum of all three angles inside any triangle is 180°.
Answer:
Nope. it is not related to that.
There are 9 seniors.
Although there are several ways of solving this problem, I just did what was easiest for me in my head. I divided 36 by 4, which gave me 9.