Answer: 180 is the sum of the tringles
Step-by-step explanation:
2x+7x+11x=180
20x=180
x=9
Now you should put the the value of x to get the angles
2x=2x9=18
7x=7x9=63
11x=11x9=99
Now to double check add all of them together
99+18+63=180
Hoped I helped!
87,240. I added them both together.
Sum= addition
The other answer is 12x2 – 8xy + 12x + y2 – 2<span>y</span><span />
Answer:
simplified 
Step-by-step explanation:
To turn a mixed number into a fraction :

3 x 4 =12 +2 =14 that will be your numerator (top number on a fraction)
and 4 will be your demoninator (bottom number)
Answer:
720 in^3.
Step-by-step explanation:
12 * 60 = 720.